镁水泥-粉煤灰复合稳定剂对黄土固化性能、增效机理及CO2平衡的改善

IF 5.8 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Sustainable Chemistry and Pharmacy Pub Date : 2025-09-22 DOI:10.1016/j.scp.2025.102217

Qi Xu, Dongliang Chen, Xuerui Yan, Chunxi Hai, Yuan Zhou

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引用次数: 0

摘要

为了解决生态脆弱的黄土高原的侵蚀问题，本研究开发了一种绿色替代波特兰水泥基固化剂：硫酸镁水泥（MOS）与工业废粉煤灰（FA）结合，符合绿色化学原理。物理试验结果表明，MOS-FA复合材料显著优化了黄土的孔隙度：对于mos - 15% FA样品，孔隙体积减小到0.233 mL/g（孔隙率为31.4%，大孔隙率为10.7%，中小孔隙率为28.8%），抗压强度从1.3 MPa提高到7.1 MPa。微观结构分析表明，水化产物（片状Mg(OH)2、絮状M-S-H/M-A-S-H/ C-S-H、针状5·1·7相）填充颗粒孔隙并形成连接，TG/DTG证实水化产物为硅酸盐水合物。固化机理依靠双重“化学胶结（产品封装/缠结）-物理填充（未反应FA孔隙填充）”效应，实现颗粒结合和微观结构致密化，提高力学性能。在同等强度要求下，MOS-FA表现出优异的碳排放性能，突出了其稳定黄土的环境可持续性。

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Enhanced performance, synergistic mechanism, and better CO2 balance of loess solidification with magnesium cement-fly ash composite stabilizing agent

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Enhanced performance, synergistic mechanism, and better CO2 balance of loess solidification with magnesium cement-fly ash composite stabilizing agent

To address erosion on the ecologically fragile Loess Plateau, this study develops a green alternative to Portland cement-based solidifiers: magnesium oxysulfate cement (MOS) combined with industrial waste fly ash (FA), aligned with green chemistry principles. Physical tests show the MOS-FA composite notably optimizes loess porosity: for the MOS-15 %FA sample, pore volume decreases to 0.233 mL/g (31.4 % porosity, macropores 10.7 %, medium/small pores 28.8 %), and compressive strength rises from 1.3 MPa to 7.1 MPa. Microstructural analysis reveals hydration products (sheet-like Mg(OH)₂, flocculent M-S-H/M-A-S-H/C–S–H, acicular 5·1·7 phase) fill particle pores and form connections, with TG/DTG confirming silicate hydrates. The solidification mechanism relies on dual “chemical cementation (product encapsulation/entanglement) - physical filling (unreacted FA pore-filling)” effects, achieving particle bonding and microstructural densification to enhance mechanical properties. Under comparable strength requirements, MOS-FA exhibits superior carbon emission performance, underscoring its environmental sustainability for loess stabilization.

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来源期刊

Sustainable Chemistry and Pharmacy Environmental Science-Pollution

CiteScore

8.20

自引率

6.70%

发文量

274

审稿时长

37 days

期刊介绍： Sustainable Chemistry and Pharmacy publishes research that is related to chemistry, pharmacy and sustainability science in a forward oriented manner. It provides a unique forum for the publication of innovative research on the intersection and overlap of chemistry and pharmacy on the one hand and sustainability on the other hand. This includes contributions related to increasing sustainability of chemistry and pharmaceutical science and industries itself as well as their products in relation to the contribution of these to sustainability itself. As an interdisciplinary and transdisciplinary journal it addresses all sustainability related issues along the life cycle of chemical and pharmaceutical products form resource related topics until the end of life of products. This includes not only natural science based approaches and issues but also from humanities, social science and economics as far as they are dealing with sustainability related to chemistry and pharmacy. Sustainable Chemistry and Pharmacy aims at bridging between disciplines as well as developing and developed countries.