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Article
Mechanics
Jiangyu Wu et al.
Summary: In this study, a discrete element model considering media properties and interface differences was constructed to reveal the mesoscopic fracture characteristic of cemented rockfill. The effects of aggregate strength and mass fraction on strength, deformation, energy, and cracking of cemented rockfill were investigated. The results showed that the failure induced by damaged aggregates is more severe than the generally concerned two-element intergranular fracture. The development of cemented rockfill requires attention to the compatibility characterized by the aggregates to cement matrix strength ratio and aggregate mass fraction.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Gengjie Zhu et al.
Summary: For mines located in saline areas, the use of mine water containing chloride salts can be an efficient way to prepare cemented tailings backfill (CTB) for mined-out area treatment, saving freshwater resources. However, the impact of chloride salts on the hydration behavior and strength properties of CTB remains unclear. This study investigates the effects of different concentrations of NaCl, CaCl2, and MgCl2 on the strength of CTB prepared with alkali-activated slag binder. The results provide insights into the hydration process and microstructure of CTB, enabling the application of chloride-containing mixing water in saline mines.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Renlong Tang et al.
Summary: In this study, the influence of ammonia content on the performance of FA-based CPB was investigated. It was found that with the increase in ammonia content, the yield stress and viscosity of the FA-based CPB slurry increased, while the slump value decreased. The uniaxial compressive strength and elastic modulus of FA-based CPB decreased as the ammonia content of FA increased. The results provide reference for the green and efficient use of ammonium-containing FA.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Shenghua Yin et al.
Summary: Cemented tailings and waste-rock backfill (CTWB) was studied using a combination of laboratory testing and deep learning. A long short-term memory (LSTM) network prediction model based on genetic algorithm (GA) optimization was developed to predict the unconfined compressive strength (UCS). The GA-LSTM model showed good prediction effect with an R2 of 0.9956 in the training set and 0.9763 in the test set. Deep learning models exhibited higher accuracy than machine learning models.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Haiqiang Jiang et al.
Summary: The combined influence of curing temperature, silica modulus, and activator concentration on the time-dependent rheology of alkali-activated slag-cemented paste backfill (AAS-CPB) was investigated. Higher curing temperature reduced fluidity and increased thixotropy of CPB. A higher activator concentration weakened rheological parameters initially, but resulted in a more rapid growth rate later. AAS-CPB with higher silica modulus consistently had lower rheological parameters. The linear correlation between thixotropy and plastic viscosity differed between OPC-CPBs and AAS-CPBs.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Construction & Building Technology
Xilong Xue et al.
Summary: A study was conducted on fiber-reinforced coarse aggregate cemented backfill (FCCB) with different polypropylene fiber (PPF) contents and curing times. The results showed that FCCB slurry satisfied the requirement of self-flow transport and the strength of FCCB increased with PPF content up to 0.10%. Adding PPF improved the microscopic mechanical properties of FCCB. The study has high application value for improving mining safety.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Bingwen Wang et al.
Summary: In order to promote the application of cemented backfill mining in high-altitude underground mines, it is necessary to investigate the mechanical performance of cemented paste backfill (CPB) under low temperature and low atmospheric pressure conditions. The study synthesized a new cementitious material by combining industrial byproducts and conducted experiments to evaluate the strength and microstructure evolution of the CPB samples. The results showed that the strength of CPB samples varied with the proportions of different materials and was significantly affected by low temperature and low atmospheric pressure.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Nan Yao et al.
Summary: The relation between segregation and strength of cemented waste rock backfill (CWRB) was analyzed by examining the aggregate distribution, uniaxial compressive strength (UCS), and failure law of the CWRB with different mass concentrations and accelerator contents. The test results showed that higher mass concentration and accelerator content led to more uniform aggregate distribution, improved skeleton structure, increased UCS, and changed material properties from plastic to elastic. The strength of the CWRB increased exponentially with the increase of the aggregate uniformity coefficient.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Wei Sun et al.
Summary: Locally fiber-reinforced layered cemented paste backfill (FR-LCPB) was prepared and tested to investigate its fracture resistance under different fiber content and reinforcement position. The results showed that the addition of fibers significantly improved the fracture resistance of FR-LCPB, with an optimal fiber content of 0.6%. The flexural strength, peak deflection, and bending modulus of FR-LCPB increased with the decrease of the distance between the fiber reinforcement position and the lower layer. Furthermore, the addition of fibers enhanced the CPB's brittle damage characteristic, ensuring it retained some strength even after failing.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Zhifa Qin et al.
Summary: The mechanical properties and damage mechanism of a novel waste-based coal gangue-filled backfill (CGFB) under the action of overburdened rock were investigated in this study. The results show that the compressive strength of CGFB samples mainly depends on the mechanical behavior of the cement-tailings grout (CTG) and the microscopic features of the interfacial transition zone (ITZ) between the coal gangue (CG) aggregate and CTG matrix. The response of ringing counts and AE energy to the development of stress shows a clear time-varying response law.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Pan Yang et al.
Summary: This study investigates the feasibility of using solid waste modified magnesia slag (MMS), coal gasification slag (CGS), and desulfurized gypsum (DG) as magnesium-coal slag based cementitious materials (MCC) for mining cementitious materials in synergy with coal gangue to prepare backfill materials. The results show the existence of synergistic effect among MMS, CGS, and DG in a ternary system, and the optimal dosing of each raw material is determined. The backfill material prepared by MCC in collaboration with coal gangue meets the preliminary feasibility for mine backfill. This research is of great importance for the comprehensive utilization of bulk solid waste, reducing backfill costs, and enhancing the economic and ecological interests of mines.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Construction & Building Technology
K. El Mahboub et al.
Summary: The addition of superabsorbent polymers (SAP) to cemented paste backfill (CPB) made from tailings slurries can improve the rheological behavior and water absorption capacity. Results show that SAP addition reduces the yield stress and viscosity, and increases the slump height of the CPB mixtures. Moreover, the SAP-thickened CPB exhibits a distinct shear-thinning behavior, while the reference CPB without SAP exhibits a normal shear-thinning behavior.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Minggen Zhang et al.
Summary: This study examines the influence of mechanical activation on the cementitious activity of ultra-fine tailings and the filling performance and hydration mechanisms of a clinker-free backfilling body. Through adjusting the ratio and slurry concentration, it is found that the substances formed during the hydration of steel slag and granulated blast furnace slag can enhance the strength of the cementitious body.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Huafu Qiu et al.
Summary: Experimental tests were conducted on the acoustic emission characteristics of cemented tailings backfill under uniaxial compression with different cement-sand ratios and waste rock contents. The results showed that an increase in waste rock content affected the mechanical properties of the backfill body, and the cement-sand ratio and waste rock content had a significant impact on the mechanical properties of the backfill body.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Geological
Weiqi Wang et al.
Summary: The anisotropy of composite rocks is affected by material difference and inclination angle, with differential deformation, damage, and relative sliding tendency increasing with higher material difference and inclination angle. Different failure modes exist in composite specimens at different angles.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Construction & Building Technology
Zhenqi Wang et al.
Summary: In this study, the isothermal multiphysics processes of cemented paste backfill (CPB) materials under different cement-to-tailings ratios were investigated. The analysis of hydration products and pore structure of CPB at different curing times and ratios was conducted using SEM, XRD, TGA, and MIP micro-analysis. A monitoring program was implemented to study the evolution of matric suction, volumetric water content, and electrical conductivity. The correlation among multiphysics processes under isothermal conditions was established through regression analysis. The findings contribute to the understanding of CPB behavior and its optimal design.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yuxiang Tang et al.
Summary: This study proposes a fully recycled aggregate concrete (FRAC) prepared by replacing natural aggregates and partially replacing cement with recycled materials. The addition of recycled materials has a negative effect on concrete strength and shows little effect on the ascending branch of stress-strain curves but influences the descending branch. The elastic modulus decreases due to the incorporation of recycled aggregates and recycled powder.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Xuepeng Song et al.
Summary: This study investigated the dynamic mechanical response of cemented tailings backfill mixed with alkalized rice straw (ARS) under frequent blasting disturbances. The results showed that ARS improved the dynamic compressive strength of the backfill under single impact load with different strain rates. Under cyclic impact loads, the mechanical properties of the backfill decreased with an increase in the cyclic impact times, but the incorporation of ARS promoted the absorption of energy and decelerated the decay rate. The research results provide a reference for understanding the dynamic mechanical response of cemented tailings backfill with ARS.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Zepeng Yan et al.
Summary: Cemented tailing-waste rock backfill (CTWB) plays an important role in improving the ecological environment of the mine. The rheological and wall-slip characteristics of CTWB paste were analyzed and a numerical model was established to simulate the flow process. The results showed that CTWB is a yield-plastic fluid with shear-thickening phenomenon at certain solids content. Increasing the coarse aggregate content improved the fluidity of the paste. The slip behavior of the CTWB paste was significantly affected by the tailing-waste rock ratio, inlet velocity, and solid content.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Z. J. Xie et al.
Summary: In this study, a novel two-step intercritical heat treatment was used to adjust the microstructure of an ultra heavy E500 offshore engineering steel. The results showed that the mechanical properties of the steel were significantly improved after thermo-mechanical controlled processing, especially in terms of elongation and low-temperature toughness at the center location. This improvement can be attributed to a more homogeneous chemical composition distribution and the fine multiphase microstructure with stable retained austenite obtained in the segregation region.
Article
Chen Guan et al.
Arabian Journal of Geosciences
(2022)
Article
Environmental Sciences
Yuxin Hao et al.
Summary: This paper analyzes the damage evolution of cemented paste backfill (CPB) under different loading rates using indoor tests and numerical simulations. The moment tensor theory is introduced to simulate the acoustic emission (AE) characteristics during the loading process, and the energy conservation principle is used to explore the loading rate (LR) effect on the backfill. The results show that the uniaxial compressive strength (UCS) of the backfill first increases and then decreases as LR increases. Microcracks in the backfill slowly increase and are not significantly affected by LR until after the peak value, when they rapidly expand and propagate to form mesoscopic cracks. The temporal and spatial distribution of AE events based on the moment tensor theory are consistent with laboratory test results, and they can be divided into different periods. The characteristics of AE events are also consistent with the evolution of microcracks, with fewer events before the peak value and a significant increase in magnitude and frequency after the peak value. AE events dense zone and events with larger magnitudes increase under higher LR. Furthermore, the boundary energy and dissipation energy gradually increase, while the strain energy first increases and then decreases. These findings provide insights into the damage evolution characteristics of backfill under different LR and AE mesoscopic simulation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Tugrul Kasap et al.
Summary: The management of tailings created during ore processing is a challenging task for mining companies and the environment. This study focuses on the usability of dam tailings in cemented mine/paste backfill (CMB/CPB), considering the physico-chemical and micro-structural aspects. The results show that the strength of backfill can be improved by increasing basicity/age, but backfills made with sulfide-rich tailings may experience a decrease in strength. Additionally, the pH values detected by chemical tests can increase or decrease over time due to acid formations and erosions, which play a key role in the deterioration of CPB physically, chemically, and microstructurally.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Construction & Building Technology
Jian Yang et al.
Summary: The fracture evolution characteristics of fiber-reinforced backfill were explored through the analysis of amplitude correlation dimension, RA correlation dimension, and time of acoustic emission. The study found that the fiber-reinforced backfill exhibits good fractal characteristics, with the amplitude time series showing better fractal properties compared to the RA time series.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Tugrul Kasap et al.
Summary: This study aims to increase the short-/long-term filling performance and reduce cement-related costs by using sand as tailings substitute and GBS or FA as OPC substitution in cementitious paste/mine backfill. The results showed that 30% sand-based CMB offered the best strengths, and strength gain was observed in sand/GBS-based backfills up to 180 days. This study provides a comprehensive report on a cost-effective and viable CMB system that will both make operations profitable/sustainable and prevent environmental damages.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yiming Wang et al.
Summary: This paper comprehensively explores the effects of interface roughness and interface angle on the mechanical properties and damage evolution of layered cemented gangue backfill (LCGB), which is of great significance in ensuring the stability of underground engineering.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Review
Environmental Sciences
Guan Chen et al.
Summary: Uniaxial compression tests were conducted on cemented backfill with different particle size gradations to study the effect of backfill aggregate particle size on compressive strength and failure mode. The damage evolution mechanism of cemented backfill with different particle size gradations was discussed by analyzing the characteristics of acoustic emission during the failure process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Jianzhuang Xiao et al.
Summary: This paper studied the fracture behavior of fully recycled aggregate concrete (FRAC), and found that the use of recycled coarse and fine aggregates (RCA and RFA) resulted in different fracture mechanisms. The substitution of RCA had little effect on critical crack opening displacements, while the substitution of RFA and RP increased and decreased them, respectively. The use of recycled aggregates reduced the fracture energy and toughness, while the use of recycled powder had limited impact.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Zaid Aldhafeeri et al.
Summary: The reactivity of sulphidic cemented paste tailings (CPT) is significantly dependent on curing temperature, initial sulphate content, and their interaction. Increasing curing temperature and sulphate concentration lead to higher reactivity, with the addition of mineral admixtures playing a role in reducing reactivity compared to samples made only with Portland cement.
INTERNATIONAL JOURNAL OF MINING RECLAMATION AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Chen Shunman et al.
Summary: The study found that curing stress and curing temperature have coupled effects on the physical and mechanical properties of cemented paste backfill (CPB), influencing the hydration reaction rate and UCS acquisition. They also significantly impact the water content, dry density, and stress-strain curve of CPB.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Jiangyu Wu et al.
Summary: The study evaluated the mesoscopic structure of cemented waste rock backfill (CWRB) and found that the particle size distribution affects crack evolution, force chain structure, and particle fragment. The fractal dimension of crack distribution is correlated with the PSD of aggregates, and the strength of CWRB is related to the fractal dimension of crack distribution.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Dan Ma et al.
Summary: The study shows that with increasing wetting-drying cycles, the porosity and permeability of CPB samples increase, with those having smaller particle size distribution and cementing strength being more sensitive. The uniaxial compressive strength and elastic modulus of CPB samples deteriorate during wetting-drying cycles, especially for those with smaller particle size distribution and cementing strength. The deterioration process of mechanical properties of CPB samples due to wetting-drying cycles can be divided into initial deterioration and re-deterioration stages, with the periodic destruction of the cemented structures verified through microstructure analysis.
Article
Construction & Building Technology
Liwei Xin
Summary: The study evaluates the mechanical behaviour of cemented tailings-rock backfill (CTRB) using 2D meso-scale models, finding that increasing waste rock content leads to brittleness and lower strength in CTRB under compressive loading, while the models behave similarly under tensile loading.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Construction & Building Technology
S. K. Behera et al.
Summary: The article critically reviews the utilization of industrial waste materials (tailings, fly ash, and slag) as paste backfill material for filling underground mine voids. It discusses the factors influencing backfill performance and future research directions in the field.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Green & Sustainable Science & Technology
Guan Chen et al.
Summary: AMD causes serious environmental pollution due to its high acidity, toxic metal content, and sulfate content. Various remediation technologies have been developed to reduce its negative impacts, but limitations such as continuous supply of chemicals and energy, expensive maintenance costs, and long-term monitoring still exist. Resource recovery and reuse are crucial for achieving sustainable AMD treatment.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Jiangyu Wu et al.
Summary: Confining pressure, cement dosage, and aggregate particle size distribution were investigated to evaluate the creep behavior of CWRB. The results showed that these factors are crucial for optimizing the stability of CWRB and protecting underground aquifers and surface buildings.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Gholamreza Asadollahfardi et al.
Summary: This study investigated the feasibility of using Electrokinetic Remediation to remove lead and zinc from mine tailings in Iran. It found that using citric acid 1 M as a catholyte conditioning agent dramatically enhanced the removal of lead and zinc.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Chemical
Zhenbang Guo et al.
Summary: Utilizing a blended binder and superplasticizer to improve the performance of superfine-tailings cemented paste backfill (SCPB) can enhance its fluidity and strength, optimizing the system's overall performance. The study results demonstrate that the proposed coupling model accurately predicts the packing density of the cementitious system, providing theoretical support for the engineering application of SCPB.
Article
Zhenjiang Wen et al.
Arabian Journal of Geosciences
(2021)
Article
Construction & Building Technology
Shi Wang et al.
Summary: The research showed that replacing cement with RSA can reduce costs while improving the strength performance of CTB. The addition of RSA decreased the fluidity of fresh CTB but still maintained pipeline transportation. Additionally, replacing cement with RSA positively correlated with an increase in UCS and improved the microstructure of CTB.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Multidisciplinary
Zehua Wang et al.
Summary: The use of horizontal electrical resistivity can effectively monitor the segregation characteristics in pipes, with decreasing differences in resistivity between layers as mass concentration increases. Diametrical electrical resistivity is less sensitive to segregation and can only distinguish the stability differences in GCPBs with lower mass concentrations.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Construction & Building Technology
Shaojie Chen et al.
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Review
Green & Sustainable Science & Technology
Shenghua Yin et al.
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Construction & Building Technology
Weishuo Yan et al.
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Engineering, Civil
Lei Yang et al.
ENGINEERING STRUCTURES
(2020)
Article
Engineering, Multidisciplinary
Lichun Jiang et al.
ALEXANDRIA ENGINEERING JOURNAL
(2020)
Article
Green & Sustainable Science & Technology
Jiangyu Wu et al.
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Construction & Building Technology
Jie Wang et al.
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Engineering, Geological
Fanzhen Meng et al.
ROCK MECHANICS AND ROCK ENGINEERING
(2019)
Article
Green & Sustainable Science & Technology
Hongjian Lu et al.
JOURNAL OF CLEANER PRODUCTION
(2018)
Article
Construction & Building Technology
Jiangyu Wu et al.
CONSTRUCTION AND BUILDING MATERIALS
(2018)
Article
Construction & Building Technology
Ivan Navarrete et al.
CONSTRUCTION AND BUILDING MATERIALS
(2017)
Article
Construction & Building Technology
Jianguo Han et al.
CONSTRUCTION AND BUILDING MATERIALS
(2016)
Article
Construction & Building Technology
M. C. G. Juenger et al.
CEMENT AND CONCRETE RESEARCH
(2011)
