![]() ![]() Straatsma, The missing term in effective pair potentials, J. Abdolhosseini Qomi, On the significance of interfacial chemistry on the strength of fly ash-cement composites, Cem. Fourie, Initial hydration process of calcium silicates in Portland cement: A comprehensive comparison from molecular dynamics simulations, Cem. van Vliet, Comparison of computational water models for simulation of calcium-silicate-hydrate, Comput. Daimon, Hydration of fly ash cement, Cem. Snellings, Reactivity of supplementary cementitious materials (SCMs) in cement blends, Cem. Siddique, Recent advances in understanding the role of supplementary cementitious materials in concrete, Cem. Groves, Electron microscopy study of ordinary Portland cement and ordinary Portland cement-pulverized fuel ash blended pastes, J. Kumar, Fly ash for sustainable construction: A review of fly ash concrete and its beneficial use case studies, Cleaner Mater., 6(2022), art. Sasmal, Early-age strength development in fly ash blended cement composites: Investigation through chemical activation, Mag. Li, Property investigation of individual phases in cementitious composites containing silica fume and fly ash, Cem. ![]() Ma, Effects of aggregate strength and mass fraction on mesoscopic fracture characteristics of cemented rockfill from gangue as recycled aggregate, Compos. Sun, CT scanning of internal crack mechanism and strength behavior of cement-fiber-tailings matrix composites, Cem. Yin, Experiment and molecular dynamics study on the mechanism for hydrophobic impregnation in cement-based materials: A case of octadecane carboxylic acid, Constr. Du, Effects of carbon nanotube dosage and aggregate size distribution on mechanical property and microstructure of cemented rockfill, Cem. Gebrehiwet Tewele, Review on effects of graphene oxide on mechanical and microstructure of cement-based materials, Constr. Hou, Numerical study on microscale and macroscale strength behaviors of hardening cemented paste backfill, Constr. Yang, Microscale mechanism of tailing thickening in metal mines, Int. Wu, et al., Flocculated unclassified tailings settling efficiency improvement by particle collision optimization in the feedwell, Int. Yilmaz, Effect of height to diameter ratio on dynamic characteristics of cemented tailings backfills with fiber reinforcement through impact loading, Constr. Zhao, et al., Effect of curing time on the mesoscopic parameters of cemented paste backfill simulated using the particle flow code technique, Int. Miao, Coupled effects of cement type and water quality on the properties of cemented paste backfill, Int. The use of optimal FA dosage and Ca/Si ratio leads to suitable water absorption, which further affects the failure mode of FA-CSH.Ī.X. The water absorption of the FA-CSH model is negatively correlated with the FA dosage and Ca/Si ratio. The hydrogen bonds among water molecules cannot withstand high stresses, resulting in a reduction in strength. A low Ca/Si ratio results in an increase in water molecules and a decrease in the ionic bonds combined with Ca 2+. ![]() In addition, the hydrogen bonds among water molecules deteriorate, reducing the matrix strength. However, this enhancement is weakened by supplementing excessive FA dosage. The FA-CSH model indicates that FA can reinforce the silica chain of C–S–H to increase the matrix strength. XRD and SEM–EDS findings show that the Ca/Si ratio of C–S–H decreases with the progression of hydration. The results show that the strength of CTB increases initially and then decreases with FA dosage, and the FA supplement leads to a decrease in Ca(OH) 2 diffraction intensity and Ca/Si ratio around the FA particles. ![]() The influences of FA dosage and calcium/silica molar ratio (Ca/Si ratio) on the matrix strength and failure model were analyzed to reveal the mechanism of FA on calcium silicate hydrated (C–S–H). A molecular model of FA-CSH was constructed to reproduce the molecular structure evolution of CTB with FA based on the test results. Consequently, this study conducted uniaxial compression, X-ray diffraction (XRD), and scanning electron microscopy (SEM)–energy dispersive spectrometer (EDS) tests to investigate the effect of FA dosage on the mechanical property and microstructure of CTB. However, its mechanism on CTB with low cement dosage and low Ca system remains unclear. Fly ash (FA) can potentially address this problem and further replace cement in favor of low carbon development. The great challenge of cemented tailings backfill (CTB) is difficult simultaneously maintaining its excellent mechanical properties and low cost. ![]()
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