Heliyon, Journal Year: 2024, Volume and Issue: 10(22), P. e39588 - e39588
Published: Oct. 18, 2024
Language: Английский
Frontiers in Earth Science, Journal Year: 2024, Volume and Issue: 12
Published: Sept. 30, 2024
Cemented paste backfill (CPB) is a technology that has positive impact on both the environment and mining safety. In recent years, it been widely applied developed. To improve carbon sequestration efficiency of CPB, air-entraining agent addition to CO 2 -injected CPB (CO -CPB) proposed. However, influence agents rheological properties -CPB not investigated date. Therefore, sodium dodecyl sulphate (SDS), an agent, was selected in this study, added with SDS were comprehensively investigated. samples 0.0‰, 0.5‰, 1.0‰, 1.5‰ prepared, parameters (yield stress viscosity) tested after curing for 0, 0.25, 1, h. Gas content testing, microscopic analysis, zeta potential measurements performed. The results show decreased yield viscosity at 0–1 h; however, increased significantly improved performance -CPB. findings study have important implications development solid waste utilisation.
Language: Английский
Citations
1
Journal of the American Ceramic Society, Journal Year: 2024, Volume and Issue: 108(3)
Published: Nov. 11, 2024
Abstract This work was designed to investigate the influence of arsenic dosage, variety on mechanical properties, hydration, and solidification from perspective Portland cement (PC) performance evolution. The results demonstrate that using PC could solidify wastes effectively, with leaching concentrations consistently below 5 mg/L. Arsenic retard leading a slower rate hydrates formation, disrupting calcium silicate hydrate (C–S–H) stacking structure, thus detrimental strength development especially at early age. adverse effect is highly dependent variety. insoluble arsenate exhibits least impact, while arsenates show largest challenging immobilization due instability hydrates. Molecular dynamic simulation indicates can be chemically immobilized Ca 2+ , physically adsorbed onto positively charged C–S–H by forming As‐O···Ca···Si‐O units, accompanied significant reduction in adsorption energy 46.5%. behavior provides basis for resource utilization cementitious materials.
Language: Английский
Citations
1
Case Studies in Construction Materials, Journal Year: 2024, Volume and Issue: 21, P. e03621 - e03621
Published: Aug. 8, 2024
Currently, more attention is focused on the durability of microbial mineralization solidification sandy soil in high-temperature environments to enhance unconfined compressive strength (UCS), while with less emphasis immobilization effect heavy metals. Lead (Pb)-zinc(Zn) mining tailings (LZMT) has characteristics loose and release metal pollutants. This experiment, based curing technology, using LZMT as raw materials conduct experiments, temperature was evaluated by UCS fixation rate ions key indexes. Combined fourier transform infrared spectroscopy (FTIR), X-ray diffractometer (XRD), scanning electron microscope-energy dispersive (SEM-EDS), we revealed mechanism affecting LZMT. The results showed that during LZMT, Sporosarcina pasteurii mainly removed through electrostatic attraction precipitation reactions. Temperature had almost no impact solidifying specimens an initial increase then decrease trend. maximum at 125°C, reaching 1.53 MPa, which 47% higher than 50°C. study instructive for application field building materials.
Language: Английский
Citations
0
Heliyon, Journal Year: 2024, Volume and Issue: 10(22), P. e39588 - e39588
Published: Oct. 18, 2024
Language: Английский
Citations
0