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Precise and non-destructive approach for identifying the real concentration based on cured cemented paste backfill using hyperspectral imaging 认领 引用 被引量：2
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作者 Qing Na Qiusong Chen Aixiang Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第1期116-128,共13页
Cemented paste backfill(CPB)is a technology that achieves safe mining by filling the goaf with waste rocks,tailings,and other materials.It is an inevitable choice to deal with the development of deep and highly diffic... Cemented paste backfill(CPB)is a technology that achieves safe mining by filling the goaf with waste rocks,tailings,and other materials.It is an inevitable choice to deal with the development of deep and highly difficult mines and meet the requirements of environmental protection and safety regulations.It promotes the development of a circular economy in mines through the development of lowgrade resources and the resource utilization of waste,and extends the service life of mines.The mass concentration of solid content(abbreviated as“concentration”)is a critical parameter for CPB.However,discrepancies often arise between the on-site measurements and the pre-designed values due to factors such as groundwater inflow and segregation within the goaf,which cannot be evaluated after the solidification of CPB.This paper innovatively provides an in-situ non-destructive approach to identify the real concentration of CPB after curing for certain days using hyperspectral imaging(HSI)technology.Initially,the spectral variation patterns under different concentration conditions were investigated through hyperspectral scanning experiments on CPB samples.The results demonstrate that as the CPB concentration increases from 61wt%to 73wt%,the overall spectral reflectance gradually increases,with two distinct absorption peaks observed at 1407 and 1917 nm.Notably,the reflectance at 1407 nm exhibited a strong linear relationship with the concentration.Subsequently,the K-nearest neighbors(KNN)and support vector machine(SVM)algorithms were employed to classify and identify different concentrations.The study revealed that,with the KNN algorithm,the highest accuracy was achieved when K(number of nearest neighbors)was 1,although this resulted in overfitting.When K=3,the model displayed the optimal balance between accuracy and stability,with an accuracy of 95.03%.In the SVM algorithm,the highest accuracy of 98.24%was attained with parameters C(regularization parameter)=200 and Gamma(kernel coefficient)=10.A comparative analysis of precision,accuracy,and recall further highlighted that the SVM provided superior stability and precision for identifying CPB concentration.Thus,HSI technology offers an effective solution for the in-situ,non-destructive monitoring of CPB concentration,presenting a promising approach for optimizing and controlling CPB characteristic parameters. 展开更多
关键词 cemented paste backfill concentration hyperspectral imaging non-destructive testing
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Rheology of Paste in Mine Backfilling:Mechanisms,Models,and Key Influencing Factors 认领 引用
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作者 Mingzhi Zhang Qian Zhang +7 位作者 Haonan Zhang Xuecheng Shang Xionghuan Tan Zheyuan Jiang Yun Lin Junwei Shu Tianxing Ma Liangxu Shen 《Fluid Dynamics & Materials Processing》 EI 2026年第3期48-69,共22页
The rheological behavior of paste in mine backfilling systems is governed by multiple coupled mechanisms,including particulate structure evolution,time-dependent effects,spatially heterogeneous flow,and scale dependen... The rheological behavior of paste in mine backfilling systems is governed by multiple coupled mechanisms,including particulate structure evolution,time-dependent effects,spatially heterogeneous flow,and scale dependence.As a result,its macroscopic response cannot be adequately described by a single material parameter or purely local constitutive relations.Although significant progress has been made in experimental characterization and empirical modeling,rheological parameters reported under different conditions remain difficult to reconcile,highlighting the limitations of existing models in capturing structural evolution and nonlocal effects.This review provides a concise synthesis of current advances in paste rheology for mine backfilling applications,with emphasis on yield behavior,shear-rate-dependent nonlinear flow response,thixotropy,and shear history effects.The applicability and limitations of commonly used rheological models,including the Bingham and Herschel-Bulkley models,are critically examined.Key factors influencing paste rheology—such as particle gradation,temperature,and chemical additives—are discussed from a structure-controlled perspective.Finally,physics-constrained data-driven approaches are highlighted as a promising direction for improving the description and prediction of complex rheological behavior.Overall,this review emphasizes the need to balance experimental observability,model simplicity,and physical consistency,and highlights the importance of linking microstructural mechanisms,scale effects,and macroscopic rheological response to establish more unified and engineering-relevant frameworks for paste rheology in mine backfilling systems. 展开更多
关键词 Cemented paste backfill rheological behavior paste rheology rheological modeling yield behavior
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Protease-and lipase-producing halotolerant/halophilic strains:prediction,screening,and heterogeneous visualization of fermented shrimp paste 认领 引用
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作者 Hongli Yao Shuangping Liu +6 位作者 Tiantian Liu Dongna Ma Xiao Han Zhilei Zhou Rui Chang Zhimin Zhang Jian Mao 《Food Science and Human Wellness》 SCIE CAS CSCD 2026年第2期924-937,共14页
To obtain protease-and lipase-producing halotolerant/halophilic strains suitable for shrimp paste(SP)fermentation,the microbial community structure and enzyme-producing microbial species were analyzed and predicted us... To obtain protease-and lipase-producing halotolerant/halophilic strains suitable for shrimp paste(SP)fermentation,the microbial community structure and enzyme-producing microbial species were analyzed and predicted using metagenomics in 3 high-salt samples.Based on the linear salt gradient method,128 strains were screened.Eight halotolerant/halophilic strains highly producing 2 types of enzymes were identified and inoculated into lowsalt SP to assess the heterogeneity of SP.Physicochemical properties of SP indicated that Bacillus subtilis XJ-11,Virgibacillus halodenitrificans XJ-229,Piscibacillus halophilus XY-193,and Bacillus vallismortis HT-73 were more suitable for rapid fermentation of SP.Nutritional analysis showed that SP inoculated with V.halodenitrificans XJ-229 had the highest free amino acid content and SP inoculated with P.halophilus XY-193 had the highest unsaturated fatty acid content.The former had prominent umami,sweetness,and meaty aroma,weak bitterness and fishy flavor,and the closest flavor to the control(CP)based on sensory evaluation and E-nose analysis.A total of 61 volatile compounds were detected in all samples by SPME-GC-MS,of which 32,23,40,24,and 28 were detected in the CP and SP inoculated with B.subtilis XJ-11,V.halodenitrificans XJ-229,P.halophilus XY-193,and B.vallismortis HT-73,respectively,with 12,11,12,9,and 9 key flavor compounds.Among several samples,the highest levels of pyrazines,aldehydes,alcohols,and ketones were found in SP inoculated with B.subtilis XJ-11,V.halodenitrificans XJ-229,P.halophilus XY-193,and B.vallismortis HT-73,respectively.These results suggested that inoculation of different enzyme-producing halotolerant/halophilic strains resulted in differences in SP quality and main flavors.This study provides some references for process control and interpretation of heterogeneous mechanisms in low-salt SP fermented by inoculated strains. 展开更多
关键词 Shrimp paste Metagenomics Heterogeneity Physicochemical properties Rapid fermentation Volatile compounds
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Comparative Evaluation of Chemical and Physical Expansive Agents in Cemented Paste Backfill:Expansion Behavior,Mechanical Response,and Microstructural Mechanisms 认领 引用
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作者 Lijie Guo Mengyuan Li +3 位作者 Xiaoming Wei Andrew Pan Xiaopeng Peng Tingting Ren 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期928-939,共12页
This study presents an assessment of four representative expansive additives—calcium sulphoaluminate-calcium oxide,magnesium oxide,sodium lauryl sulfate,and sodium abietate—and their effects on the expansion behavio... This study presents an assessment of four representative expansive additives—calcium sulphoaluminate-calcium oxide,magnesium oxide,sodium lauryl sulfate,and sodium abietate—and their effects on the expansion behavior,mechanical development,and microstructural characteristics of cemented paste backfill(CPB).A series of backfill mixtures containing different expansive agent types and dosages were prepared to examine their volumetric response during mixing and early hydration,uniaxial compressive strength(UCS)evolution at various curing ages,and corresponding microstructural features.The results reveal that the two physical foaming agents generated substantial instantaneous expansion during mixing,with sodium lauryl sulfate and sodium abietate reaching total relative expansion ratios of 24.38%and 10.73%at 3 days,respectively.In contrast,magnesium oxide and expansive cement produced delayed but stable expansion associated with hydration reactions.Strength testing showed strong type-dependent behavior:mixtures containing magnesium oxide or sodium abietate consistently achieved higher UCS values across all curing ages,whereas those with sodium lauryl sulfate or expansive cement exhibited significant strength reduction.Microstructural analysis further demonstrated that sodium abietate promoted a dense and continuous hydration network without the formation of interconnected pores,whereas expansive cement produced a dispersed and more porous matrix.Integrating the expansion,strength,and microstructural results shows that sodium abietate offers the most favorable balance between controlled expansion and mechanical performance,making it a promising additive for improving roof-contact efficiency and long-term structural stability in underground backfilling.The findings provide scientific support for the rational selection and optimized application of expansive agents in CPB. 展开更多
关键词 backfill-roof contacting cemented paste backfill expansive additives tailings underground mining
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Influence of Sewage Sludge Ash and Superabsorbent Polymer on Volume Deformation of Cement Paste with Low Water/binder Ratio 认领 引用
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作者 GU Chunping YU Zhe +6 位作者 ZHANG Jiahui BAO Zhenan WEI Haixia XU Yanwen WANG Qiannan DING Cong KONG Deyu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期768-777,共10页
In order to facilitate the recycling of sewage sludge ash(SSA),and to reveal the effects of SSA and super absorbent polymers(SAP)on the volumetric deformation of the high performance cementbased materials,the separate... In order to facilitate the recycling of sewage sludge ash(SSA),and to reveal the effects of SSA and super absorbent polymers(SAP)on the volumetric deformation of the high performance cementbased materials,the separate and coupled effects of SSA and SAP on the volumetric deformation of the cement pastes with a low water/binder ratio(0.25)under different environmental conditions(sealed,drying,and water immersion environments)were studied.The results showed that the addition of SSA or SAP reduced the autogenous and drying shrinkage,and increased the water immersion expansion strain of the cement pastes.The addition of SSA and SAP together further reduced the autogenous and drying shrinkage,and increased the water immersion expansion.The synergistic effect of SSA and SAP on the volumetric deformation of the cement pastes was observed under a sealed environment.It was less significant under a water immersion environment.Under drying environment,the reduction in shrinkage caused by the combined addition of SSA and SAP was lower than the sum of the reduced shrinkages caused by SSA and SAP alone.These findings provided a new potential approach for the recycling and utilization of SSA. 展开更多
关键词 cement paste sewage sludge ash super absorbent polymer volumetric deformation
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Characterizing dynamic segregation behavior in cemented paste during pipeline transport through electrical resistance tomography 认领 引用
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作者 Yingjie Chang Aixiang Wu +4 位作者 Zhu’en Ruan Shaoyong Wang Jiandong Wang Shulong Liu Shuangcheng Du 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第3期798-808,共11页
Cement paste backfill(CPB)technology is a key method for mine waste treatment,and pipeline transport is critical for safe and efficient waste transfer.Variations in raw material properties can cause slurry segregation... Cement paste backfill(CPB)technology is a key method for mine waste treatment,and pipeline transport is critical for safe and efficient waste transfer.Variations in raw material properties can cause slurry segregation,increase pipeline wear and resistance,raise the risk of blockages or bursts,and disrupt operations.To study CPB slurry segregation during transport,CPB was prepared using cement as the cementitious material and unclassified tailings as inert materials.A small annular-tube device using an electrical resistance tomography system was developed to analyze its flow characteristics,and quantitative segregation assessment methods were developed.The results indicated that CPB conductivity increases with transport time but decreases with higher solid mass content,with the latter having a greater impact.At a low solid content,solid particles migrated toward the bottom of the pipe as the flow time increased,and the migratory behavior of the particles diminished as the solid content increased.At a flow rate of 1.25 m/s,the heterogeneity index for CPB with 58wt% solid content increased by 1.24 in 20 min,whereas that for CPB with 62wt% solid content increased by 2.17.Higher solid mass content amplifies the effect of conveying time on segregation,emphasizing the need to balance these factors for minimizing segregation.These insights can guide the optimization of mine pipeline transport systems. 展开更多
关键词 cement paste backfill electrical resistance tomography dynamic segregation pipeline transport
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Mechanical response and pore pressure evolution of cemented paste backfill under deep mine-like multiaxial stress and temperature conditions 认领 引用
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作者 Hongbin Liu Mamadou Fall 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第2期457-474,共18页
As underground mining advances to greater depths,cemented paste backfill(CPB)is increasingly subjected to complex thermo-mechanical loading conditions,including multiaxial stress states and elevated temperatures.This ... As underground mining advances to greater depths,cemented paste backfill(CPB)is increasingly subjected to complex thermo-mechanical loading conditions,including multiaxial stress states and elevated temperatures.This study investigates the coupled effects of field-representative vertical self-weight and horizontal rockwall closure stresses,along with in-situ temperatures,on the mechanical behavior and pore water pressure(PWP)evolution of CPB.Experiments were conducted using a novel apparatus capable of controlling multiaxial stress and temperature during curing,replicating in-situ stress paths and thermal profiles typical of deep mine environments.Results show that multiaxial stress enhances CPB strength and stiffness by promoting denser particle packing,reducing porosity,and increasing frictional resistance.Elevated temperatures independently accelerate early-age cement hydration,further improving bond strength and stiffness.When combined,multiaxial stress and elevated temperature produce a synergistic enhancement in unconfined compressive strength(UCS)and elastic modulus,as confirmed by two-way ANOVA and synergy index analysis.PWP responses were also highly sensitive to thermo-mechanical conditions.The evolution of positive and negative PWP was governed by the interplay of thermal expansion,hydration-induced desaturation,and mechanical compaction.Multiaxial stress amplified early positive PWP and delayed its dissipation,whereas elevated temperature accelerated hydration and reduced pore pressure,leading to enhanced suction at later ages.A transient“stress-induced resaturation”effect was observed under late-stage excessive horizontal stress but was mitigated by elevated temperatures.These findings provide critical insights into the coupled mechanical and hydraulic behavior of CPB under realistic field conditions and offer guidance for optimizing backfill design,binder content,and barricade stability in deep mining applications. 展开更多
关键词 Cemented paste backfill Tailings Multiaxial stress Field temperature Mechanical properties Pore water pressure Rockwall closure
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Enhancing the performance of waste-derived super-sulfated with carbonated recycled concrete fines for cemented paste backfill applications 认领 引用
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作者 Liancheng Wang Xingtong Yue +4 位作者 Ping Jiang Xiaobo Liu Shiyu Zhang Kai Cui Yingliang Zhao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第2期492-506,共15页
This study investigates the performance enhancement of super-sulfated cement(SSC)derived from arsenic-containing bio-oxidation waste(BW)through the incorporation of carbonated recycled concrete fines(CRCF).The finding... This study investigates the performance enhancement of super-sulfated cement(SSC)derived from arsenic-containing bio-oxidation waste(BW)through the incorporation of carbonated recycled concrete fines(CRCF).The findings revealed that the addition of 5wt%CRCF yields optimal performance,with compressive strengths reaching approximately 1.83,12.59,and 42.81 MPa at 1,3,and 28 d,respectively.These values represented significant increases of 408.3%,10.0%,and 14.3%compared to the reference sample.The improvement was attributed to the synergistic effects of ultrafine CRCF particles acting as fillers and nucleation sites,as well as the high reactivity of silica gels,which promoted the formation of additional hydration gels.Microstructural analysis confirmed that CRCF addition refined pore structure,and enhanced the stiffness of C-S-H gels.Furthermore,CRCF served as a net CO2 sink,sequestering 0.268 kg CO2 per kilogram of CRCF and thereby reducing the carbon footprint of SSC.In addition,the feasibility of applying CRCF-modified SSC in cemented paste backfill(CPB)is highlighted,given the high cement-related carbon footprint of conventional CPB.When 5wt%CRCFmodified SSC was employed in CPB,its 3-d compressive strength attained over 70%of that of ordinary Portland cement(OPC),while the 28-d strength was comparable to that of OPC.The proposed binder thus provides a sustainable pathway for BW valorization,combining waste utilization,carbon sequestration,and improved engineering performance. 展开更多
关键词 super-sulfated cement compressive strength bio-oxidation waste arsenic cemented paste backfill
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Coupled effects of sodium lignosulfonate and water-to-binder mass ratio on rheology,strength and microstructure of high-volume fly ash cemented paste backfill 认领 引用
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作者 Haoyan Lyu Xiaoxiao Cao +2 位作者 Hideki Shimada Takashi Sasaoka Akihiro Hamanaka 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第7期2178-2193,共16页
High-volume fly ash(HVFA)binders are widely utilized as a mature method for cemented paste backfill in green mining,yet their performance remains highly sensitive to mix design.The fundamental coupling mechanism betwe... High-volume fly ash(HVFA)binders are widely utilized as a mature method for cemented paste backfill in green mining,yet their performance remains highly sensitive to mix design.The fundamental coupling mechanism between the water-to-binder mass ratio(W/B)and sodium lignosulfonate(SL)content in pozzolan-rich HVFA systems remains insufficiently understood.In this study,HVFA pastes with varying SL contents(0-0.9wt%)and W/B(0.5-0.8)were characterized via rheometry,unconfined compressive strength(UCS)tests,and microstructural analyses,including zeta potential measurements.Results indicated that the absolute zeta potential magnitude increased from 11.88 to 27.08 mV as SL dosage rose from 0 to 0.9wt%,providing direct evidence for enhanced electrostatic repulsion.This surface modification significantly reduced yield stress and decreased the Relative Thixotropic Index(RTI)from 14.99% to7.88% at a W/B of 0.5 with 0.3wt%SL.The effect of SL on 28-d UCS was non-monotonic,peaking at 35.72 MPa with 0.3wt%SL.The mercuty intrusion porosimetry(MIP)analysis revealed a primary pore diameter shift from the harmful range(~284 nm)to the refined range(183 nm),while X-ray diffraction(XRD)analysis confirmed enhanced calcium hydroxide consumption via pozzolanic reactions.The findings elucidate the dual role of SL as a physical dispersant optimizing particle packing and a chemical modulator governing hydration kinetics.These quantitative relationships provide a scientific basis for the performance-based design and intelligent pumping control of HVFA binders. 展开更多
关键词 cemented paste backfill high-volume fly ash binders sodium lignosulfonate rheological behavior water-to-binder ratio mi-crostructure zeta potential intelligent pumping control
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Strength,Self-flowing,and Multi-objective Optimization of Cemented Paste Backfill Materials Base on RSM-DF 认领 引用 被引量：1
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作者 LIU Chunkang WANG Hongjiang +2 位作者 WANG Hui SUN Jiaqi BAI Longjian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第2期449-461,共13页
The multi-objective optimization of backfill effect based on response surface methodology and desirability function(RSM-DF)was conducted.Firstly,the test results show that the uniaxial compressive strength(UCS)increas... The multi-objective optimization of backfill effect based on response surface methodology and desirability function(RSM-DF)was conducted.Firstly,the test results show that the uniaxial compressive strength(UCS)increases with cement sand ratio(CSR),slurry concentration(SC),and curing age(CA),while flow resistance(FR)increases with SC and backfill flow rate(BFR),and decreases with CSR.Then the regression models of UCS and FR as response values were established through RSM.Multi-factor interaction found that CSR-CA impacted UCS most,while SC-BFR impacted FR most.By introducing the desirability function,the optimal backfill parameters were obtained based on RSM-DF(CSR is 1:6.25,SC is 69%,CA is 11.5 d,and BFR is 90 m3/h),showing close results of Design Expert and high reliability for optimization.For a copper mine in China,RSM-DF optimization will reduce cement consumption by 4758 t per year,increase tailings consumption by about 6700 t,and reduce CO2emission by about 4758 t.Thus,RSM-DF provides a new approach for backfill parameters optimization,which has important theoretical and practical values. 展开更多
关键词 cemented paste backfill response surface methodology desirability function multi-objective optimization
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CO2mineralization curing steel slag-fly ash-Portland cement ternary paste:Mechanical properties,microstructure and life cycle assessment 认领 引用 被引量：1
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作者 YI Guo-yang TIAN Wei +2 位作者 SHI Jun-jie GUO Jian CHENG Xu 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第7期2487-2510,共24页
Using solid waste as a substitute for conventional cement has become an important way to reduce carbon emissions.This paper attempted to utilize steel slag(SS)and fly ash(FA)as supplementary cementitious material by u... Using solid waste as a substitute for conventional cement has become an important way to reduce carbon emissions.This paper attempted to utilize steel slag(SS)and fly ash(FA)as supplementary cementitious material by utilizing CO2mineralization curing technology.This study examined the dominant and interactive influences of the residual water/cement ratio,CO2pressure,curing time,and SS content on the mechanical properties and CO2uptake rate of CO2mineralization curing SS-FA-Portland cement ternary paste specimens.Additionally,microstructural development was analyzed.The findings demonstrated that each factor significantly affected compressive strength and CO2uptake rate,with factor interactions becoming more pronounced at higher SS dosages(>30%),lower residual water/cement ratios(0.1-0.15),and CO2pressures of 0.1-0.3 MPa.Microscopic examinations revealed that mineralization primarily yielded CaCO3and silica gel.The residual w/c ratio and SS content significantly influenced the CaCO3content and crystallinity of the mineralization products.Post-mineralization curing,the percentage of pores larger than 50 nm significantly decreased,the proportion of harmless pores smaller than 20 nm increased,and pore structure improved.This study also found that using CO2mineralization curing SS-FA-Portland cement solid waste concrete can significantly reduce the negative impact on the environment. 展开更多
关键词 ternary paste CO2curing response surface methodology life cycle assessment
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Rheological Properties of Composite Pastes with Steel Slag Powder or Limestone Powder at Very Low Water/Binder Ratio 认领 引用
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作者 HAN Fanghui ZHU Ziqin +2 位作者 HAN Yuchen LI Yuchen ZHANG Zengqi 《硅酸盐学报》 EI CAS CSCD 北大核心 2025年第11期3190-3205,共16页
Introduction The widespread use of cement in concrete leads to increased carbon emissions,so the demand for supplementary cementitious materials increases significantly.Limestone powder and steel slag powder are widel... Introduction The widespread use of cement in concrete leads to increased carbon emissions,so the demand for supplementary cementitious materials increases significantly.Limestone powder and steel slag powder are widely used as supplementary cementitious materials in modern concrete.However,for UHPC and self-compacting concrete,an extremely low water/binder(W/B)ratio is on one hand a key factor in achieving ultra-high strength and ultra-low porosity of the materials,on the other hand,also leads to the deterioration of the rheological properties of the fresh paste.Meanwhile,the existing researches focus on the influence of single limestone powder or steel slag powder on the mechanical properties or microstructure of cement-based materials.Little work on the influence of steel slag powder or limestone powder on the rheological properties of composite paste at an extremely low water/binder ratio has been investigated quantitatively.The mechanism of the effect of steel slag powder or limestone powder on the rheological properties of composite paste at extremely low water/binder ratios is still unclear.In this work,the effects of steel slag powder and limestone powder on the rheological properties of composite paste at different low water/binder ratios were analyzed via determining the flow diameter,setting time,marsh cone flow time,rheological parameters,and total organic carbon content.Methods A composite paste was prepared with P.I 42.5 ordinary Portland cement,steel slag powder,limestone powder,blast furnace slag and silica fume as raw materials in a certain proportion.To achieve the preparation of composite paste with extremely low water/binder ratios,a polycarboxylate superplasticizer with a watereducing rate of 40%(Jiangsu Subot New Materials Co.,Ltd.,China)was used.The dosage of polycarboxylate superplasticizer for the composite paste with different water/binder ratios of 0.16 and 0.21 was 2%and 0.8%,respectively.Composite pastes with different proportions of steel slag powder or limestone powder at water/binder ratios of 0.16 and 0.21 were prepared.The flow diameter(i.e.,the larger the flow diameter,the better the fluidity),setting time(i.e.,the time when the fluidity is lost)and marsh cone flow time(i.e.,the shorter the flow time,the better the fluidity)were determined to analyze the fluidity of the composite pastes.the rheological properties of composite paste at a water/binder ratio of 0.16 for rheological properties tests were determined,and the rheological parameters were obtained by the H-B model.The adsorption performance of the polycarboxylate superplasticizer was analyzed by testing the TOC content.Results and discussion When the ratio of water/binder is 0.16,both limestone powder and steel slag powder initially increase the flow diameter of the composite paste.However,the fluidity of the composite paste decreases over time,and the reduction is more pronounced with steel slag powder.This is because the nucleation and hydration promotion effect of limestone powder can reduce the loss rate of flow diameter,while the rough particles of steel slag powder increase the internal friction force,resulting in a decrease in the flow diameter of composite paste.Adding limestone powder and steel slag powder both shortens the setting time and marsh cone flow time of the composite paste.However,the steel slag powder addition of 30%delays the final setting time due to its delaying effect.Also,limestone powder can enhance the thixotropy and reduce the yield stress and plastic viscosity,thereby improving the rheological properties.In contrast,steel slag powder can increase the yield stress and plastic viscosity,thereby weakening the rheological properties and thixotropy.Steel slag powder and limestone powder both can enhance the adsorption effect of polycarboxylate superplasticizer.Steel slag powder has a stronger adsorption effect.The composite paste containing limestone powder has a higher free water content.This is because the rough and porous surface of steel slag itself and the uneven particle shape lead to the physical adsorption of polycarboxylate superplasticizer molecules on the surface of steel slag particles,thereby reducing the effective content of the water reducer dispersion.Increasing the water/binder ratio to 0.21 results in a decrease in the flow diameter of the composite paste.Furthermore,the setting time and marsh cone flow time can prolong due to the reduction in the dosage of polycarboxylate superplasticizer.Conclusions The results showed that the fluidity loss rate of composite paste with limestone powder could be lower than that of composite paste with steel slag powder.Compared to steel slag powder,the addition of limestone powder reduced the setting time and marsh cone flow time of the composite paste.The addition of limestone powder could shorten the yield stress and plastic viscosity of the composite paste.Therefore,the composite paste with limestone powder had better rheological properties and stronger thixotropy rather than that with steel slag powder.The addition of limestone powder could improve the rheological properties of the composite paste.Compared to composite paste with limestone powder,a better adsorption effect of polycarboxylate superplasticizer on the surface of the composite binder with steel slag powder could be obtained.The free water content of the composite paste with limestone powder was still higher than that of the composite paste with steel slag powder.The fluidity and rheological properties of the composite paste with limestone powder could be better.The comprehensive analysis indicated that a positive effect of limestone powder on rheological properties of composite paste at an extremely low water/binder ratio could be more dominant than that of steel slag powder. 展开更多
关键词 composite paste limestone powder steel slag powder rheological properties extremely low water/binder ratio
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Developing Hybrid XGBoost Model to Predict the Strength of Polypropylene and Straw Fibers Reinforced Cemented Paste Backfill and Interpretability Insights 认领 引用
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作者 Yingui Qiu Enming Li +2 位作者 Pablo Segarra Bin Xi Jian Zhou 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第8期1607-1629,共23页
With the growing demand for sustainable development in the mining industry,cemented paste backfill(CPB)materials,primarily composed of tailings,play a crucial role in mine backfilling and underground support systems.T... With the growing demand for sustainable development in the mining industry,cemented paste backfill(CPB)materials,primarily composed of tailings,play a crucial role in mine backfilling and underground support systems.To enhance the mechanical properties of CPB materials,fiber reinforcement technology has gradually gained attention,though challenges remain in predicting its performance.This study develops a hybrid model based on the adaptive equilibrium optimizer(adap-EO)-enhanced XGBoost method for accurately predicting the uniaxial compressive strength of fiber-reinforced CPB.Through systematic comparison with various other machine learning methods,results demonstrate that the proposed hybridmodel exhibits excellent predictive performance on the test set,achieving a coefficient of determination(R2)of 0.9675,root mean square error(RMSE)of 0.6084,and mean absolute error(MAE)of 0.4620.Input importance analysis reveals that cement-tailings ratio,curing time,and concentration are the three most critical factors affectingmaterial strength,with cement-tailings ratio showing a positive correlation with strength,concentrations above 70% significantly improvingmaterial strength,and curing periods beyond 28 days being essential for strength development.Fiber parameters contribute secondarily but notably to material strength,with fiber length exhibiting an optimal range of approximately 12 mm.This study not only provides a high-precision strength prediction model but also reveals the inherent correlations between various parameters and material performance,offering scientific basis for mixture optimization and engineering applications of fiber-reinforced CPB materials. 展开更多
关键词 Cemented paste backfill fiber-enhanced compressive strength prediction XGBoost adap-EO algorithm SHAP
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Failure behavior of rock and steel slag cemented paste backfill composite structures under uniaxial compression:Effects of interface angle and steel slag content 认领 引用
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作者 HAO Jian-shuai ZHOU Zi-han +1 位作者 CHEN Zhong-hui CHE Zeng-hui 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第7期2679-2695,共17页
The stability of the“surrounding rock-backfill”com posite system is crucial for the safety of mining stopes.This study systematically investigates the effects of steel slag(SS)content and interface angle on the stre... The stability of the“surrounding rock-backfill”com posite system is crucial for the safety of mining stopes.This study systematically investigates the effects of steel slag(SS)content and interface angle on the strength and failure characteristics of rock and SS-cemented paste backfill composite specimens(RBCS)through uniaxial compression strength tests(UCS),acoustic emission systems(AE),and 3 D digital image correlation monitoring technology(3 D-DIC).The intrinsic mechanism by which SS content influences the strength of SS-CPB was revealed through an analysis of its hydration reaction degree and microstructural characteristics under varying SS content.Moreover,a theoretical strength model incorporating different interface angles was developed to explore the impact of interface inclination on failure modes and mechanical strength.The main conclusions are as follows:The incorporation of SS enhances the plastic characteristics of RBCS and reduces its brittleness,with the increase of SS content,the stress-strain curve of RBCS in the“staircase-like”stag e becomes smoother;When the interface angle is 45°,the RBCS stress-strain curve exhibits a bimodal feature,and the failure mode changes from Y-shaped fractures to interface and axial splitting;The addition of SS results in a reduction of hydration products such as Ca(OH)2 in the backfill cementing system and an increase in harmful pores,which weakens the bonding performance and strength of RBCS,and the SS content should not exceed 45%;As the interface angle increases,the strength of RBCS decreases,and the critical interface slip angle decreases first and then increases with the increase in the E S/E R ratio.This study provides technical references for the large-scale application of SS in mine backfill. 展开更多
关键词 steel slag-cemented paste backfill interface angle rock-backfill composite structures failure mode
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Microstructure Evolution and Mechanism of Strength Development of Fly Ash Paste 认领 引用
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作者 MA Shuzhao WU Shunchuan +5 位作者 HUANG Mingqing CHENG Haiyong JIANG Guanzhao NIU Yonghui LIU Zemin SUN Wei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第1期152-163,共12页
Three types of activators such as sodium hydroxide,calcium oxide and triethanolamine(TEA)are used to establish different activation environments to address the problems associated with the process of activating fly as... Three types of activators such as sodium hydroxide,calcium oxide and triethanolamine(TEA)are used to establish different activation environments to address the problems associated with the process of activating fly ash paste.We conducted mechanical tests and numerical simulations to understand the evolution of microstructure,and used environmental scanning electron microscopy(ESEM)and energy dispersive spectroscopy(EDS)techniques to analyze the microenvironments of the samples.The mechanical properties of fly ash paste under different activation conditions and the changes in the microstructure and composition were investigated.The results revealed that under conditions of low NaOH content(1%-3%),the strength of the sample increased significantly.When the content exceeded 4%,the rate of increase in strength decreased.Based on the results,the optimal NaOH content was identified,which was about 4%.A good activation effect,especially for short-term activation(3-7 d),was achieved using TEA under high doping conditions.The activation effect was poor for long-term strength after 28 days.The CaO content did not significantly affect the degree of activation achieved.The maximum effect was exerted when the content of CaO was 2%.The virtual cement and concrete testing laboratory(VCCTL)was used to simulate the hydration process,and the results revealed that the use of the three types of activators accelerated the formation of Ca(OH)2 in the system.The activators also corroded the surface of the fly ash particles,resulting in a pozzolanic reaction.The active substances in fly ash were released efficiently,and hydration was realized.The pores were filled with hydration products,and the microstructure changed to form a new frame of paste filling that helped improve the strength of fly ash paste. 展开更多
关键词 paste filling fly ash activator unconfined compressive strength microstructure hydration simulation
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Conformal and rapid micro-molding manufacturing of ultraviolet-curable silver paste on curved surfaces using digital light processing 认领 引用
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作者 Mei-Ling Yang Guo-Xiang Zhou +8 位作者 Ning Xie Kun-Peng Lin Yan-Zhao Zhang Zhe Zhao Yun-Peng He Yu-Hang Zhang Zhi-Hua Yang De-Chang Jia Yu Zhou 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第10期153-161,共9页
Electronic 3D printing possesses a remarkable molding ability and convenience in integrated circuits,flexible wearables,and individual automobile requirements.However,traditional 3D printing technology still struggles... Electronic 3D printing possesses a remarkable molding ability and convenience in integrated circuits,flexible wearables,and individual automobile requirements.However,traditional 3D printing technology still struggles to meet the demands of high precision and high efficiency in the process of fabricating a curved surface circuit,particularly achieving precise silver circuit molding on irregular substrates.Here,a high-precision and muti-scaled conformal manufacturing method for silver circuits is presented through the digital light processing(DLP)of ultraviolet-curable silver paste(UV-SP)with adjustable photocuring properties,enabling the successful preparation of micro-scaled conductive structure on the sharply skewed hook face.The minimum modeling depth and width of the cured silver paste can be well controlled to 10 and 88µm,respectively.Compared with traditional printing technology,the printing efficiency of complex patterns has increased by over 70%.The printed silver circuit demonstrates an exceptionally high electrical conductivity,reaching as high as 1.16×107 S/m.Additionally,the UV-SP exhibits significant manufacturing efficiency and superior molding resolution compared to conventional direct ink writing and inkjet printing techniques,thereby contributing to the attainment of high precision and efficiency of conformal and micro-molding manufacturing in sensors,communication antennas,and other electronic devices based on curved substrates. 展开更多
关键词 Digital light processing Ultraviolet-curable silver paste Conformal manufacturing Silver circuits High precision
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Workability and Mechanical Performances of Cement Paste with Nano-TiO2 认领 引用
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作者 WANG Zigeng SHEN Yonghao +1 位作者 LI Yue DU Huan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第5期1286-1296,共11页
This article investigated the factors and mechanisms that affected the workability and mechanical properties of cement paste incorporating nano-TiO2.The findings indicated that,for nano-TiO2aqueous solution conc... This article investigated the factors and mechanisms that affected the workability and mechanical properties of cement paste incorporating nano-TiO2.The findings indicated that,for nano-TiO2aqueous solution concentrations of 3%,6%,9%,and 12%,the optimal dispersion effect was achieved with an ultrasonic dispersion time of 20 minutes.Specifically,at a 6%nano-TiO2content,both the workability and mechanical performance of the cement paste were enhanced.Furthermore,while nano-TiO2did not alter the types of hydration products present in the cement paste,it did increase the amount of C-S-H gels.This enhancement was attributed to a higher number of nucleation sites for hydration products,which promoted hydration and reduced the porosity of the cement paste. 展开更多
关键词 cement paste nano-TiO2 workability performance mechanical performance microscopic analysis
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Effect of particle gradation characteristics on yield stress of cemented paste backfill 认领 引用 被引量：35
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作者 Hai-yong Cheng Shun-chuan Wu +1 位作者 Xiao-qiang Zhang Ai-xiang Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2020年第1期10-17,共8页
Along with slurry concentration and particle density,particle size distribution(PSD)of tailings also exerts a significant influence on the yield stress of cemented paste,a non-Newtonian fluid.In this work,a paste stab... Along with slurry concentration and particle density,particle size distribution(PSD)of tailings also exerts a significant influence on the yield stress of cemented paste,a non-Newtonian fluid.In this work,a paste stability coefficient(PSC)was proposed to characterize paste gradation and better reveal its connection to yield stress.This coefficient was proved beneficial to the construction of a unified rheological model,applicable to different materials in different mines,so as to promote the application of rheology in the pipeline transportation of paste.From the results,yield stress showed an exponential growth with increasing PSC,which reflected the proportion of solid particle concentration to the packing density of granular media in a unit volume of slurry,and could represent the properties of both slurry and granular media.It was found that slurry of low PSC contained extensive pores,generally around 20μm,encouraging free flow of water,constituting a relatively low yield stress.In contrast,slurry of high PSC had a compact and quite stable honeycomb structure,with pore sizes generally<5μm,causing the paste to overcome a higher yield stress to flow. 展开更多
关键词 paste backfill grading theory yield stress paste stability coefficient microscale
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Rheological behavior of paste in metal mines 认领 引用 被引量：35
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作者 Aixiang Wu Zhuen Ruan Jiandong Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第4期717-726,共10页
Cemented paste backfill(CPB)has been one of the best practical approaches for tailings management and underground goaf treatment.Paste rheology is a science to study the flow and deformation behaviors of paste or fill... Cemented paste backfill(CPB)has been one of the best practical approaches for tailings management and underground goaf treatment.Paste rheology is a science to study the flow and deformation behaviors of paste or filling body under the effects of stress,strain,temperature,and time during the CPB process.The goal of studying paste rheology is to solve the engineering problems existing in four key processes;that is,paste rheology should meet the engineering demands of thickening,mixing,transportation,and backfilling.However,paste rheology is extremely complicated due to its high concentration,materials complexity,and engineering characteristics of non-stratification,nonsegregation,and non-bleeding.The rheological behavior of full tailings in deep thickening,rheological behavior of paste in mixing and pipeline transportation,and rheological behavior of filling body are introduced and discussed:(1)gel point,compressive yield stress,and the hindered settling function are adopted to characterize the rheological properties of full tailings in deep thickening.Combination of Coe-Clevenger theory and Buscall-White theory can also analyze the thickening performance in the whole area of deep cone thickener;(2)yield stress and viscosity are consistent with the evolution trend of the relative structure coefficient of paste in mixing;(3)coupling effect of wall slip and time-temperature dependency has a significant influence on the rheological properties and pipeline transportation;(4)damage variable is introduced to the Burgers model to describe the creep damage of the filling body.However,in-depth and systematic studies were still needed to establish a complete theoretical system of paste rheology in metal mines. 展开更多
关键词 paste rheology cemented paste backfill thickening mixing pipeline transportation
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Relationship between chloride diffusivity and pore structure of hardened cement paste 认领 引用 被引量：10
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作者 Guo-wen SUN Wei SUN +1 位作者 Yun-sheng ZHANG Zhi-yong LIU 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2011年第5期360-367,共8页
Based on effective media theory,a predictive model,relating chloride diffusivity to the capillary pores,gel pores,tortuosity factor,and pore size distribution of hardened cement,is proposed.To verify the proposed mode... Based on effective media theory,a predictive model,relating chloride diffusivity to the capillary pores,gel pores,tortuosity factor,and pore size distribution of hardened cement,is proposed.To verify the proposed model,the diffusion coefficient of chloride ions,the degree of hydration,and peak radius of capillary pores of cement paste specimens were measured.The predicted results for chloride diffusivity were compared with published data.The results showed that the predicted chloride diffusivity of hardened cement paste was in good agreement with the experimental results.The effect of the evolution of pore structures in cement paste on chloride diffusivity could be deduced simultaneously using the proposed model. 展开更多
关键词 Hardened cement paste Chloride diffusivity Porosity Tortuosity factor Constrictivity Key words:Hardened cement paste,Chloride diffusivity,Porosity,Tortuosity factor,Conslrictivity
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