工业废渣复合固化洗砂泥的强度及耐久性研究

doi:10.16552/j.cnki.issn1001-1625.2024.1531

摘要/Abstract

摘要： 采用响应面法优化工业废渣固化洗砂泥的配合比,并掺入水泥提升固化效果,得到工业废渣复合固化剂。通过无侧限抗压强度试验、水稳性试验、干湿循环试验,研究初始含水率、养护龄期和固化剂掺量对固化土强度和耐久性的影响,并采用XRD和SEM分析作用机理。结果表明:矿渣、粉煤灰、电石渣和水泥的最优配合比(质量比)为5.4∶1.7∶4.5∶2.0,固化效果优于同等掺量的水泥;工业废渣与水泥协同作用促进火山灰反应,固化土的强度和水稳性随着龄期和掺量的增加而提高,但当工业废渣复合固化剂掺量达到21.7%(质量分数)后强度降低;电石渣中CaO的水化反应提高了土体碱性,矿渣和粉煤灰中的活性硅铝酸盐在碱性环境中反应,生成的水化硅(铝)酸钙填充孔隙、团聚土壤颗粒。干湿循环为试件提供高温条件和水分,固化土的强度在一定范围内提高。

关键词: 洗砂泥, 工业废渣, 响应面法, 无侧限抗压强度, 水稳性, 干湿循环

Abstract: The response surface method was used to optimize the mix ratio of industrial waste slag curing sand washing sludge, cement was added to improve the curing effect, and the composite curing agent of industrial waste slag was obtained. Through unconfined compressive strength test, water stability test and dry-wet cycle test, the effects of initial moisture content, curing age and curing agent content on the strength and durability of curing soil were studied, and the mechanism was analyzed by XRD and SEM. The results show that the optimal mix ratio (mass ratio) of slag, fly ash, calcium carbide residue and cement is 5.4∶1.7∶4.5∶2.0, and the curing effect is better than that of the same amount of cement. The synergistic effect of industrial waste slag and cement promotes the pozzolanic reaction. The strength and water stability of curing soil increase with the increase of age and content, but the strength decreases when the industrial waste slag composite curing agent content reaches 21.7% (mass fraction). The hydration reaction of CaO in calcium carbide residue improves the alkalinity of soil. The active aluminosilicate in slag and fly ash reacts in an alkaline environment, and the generated calcium silicate hydrate and calcium aluminosilicate hydrate fill pores and agglomerates soil particles. The dry-wet cycle provides high temperature conditions and moisture for specimen, and the strength of solidified soil is improved within a certain range.

Key words: sand washing sludge, industrial waste, response surface method, unconfined compressive strength, water stability, dry-wet cycle

中图分类号:

U416.1

杜俊彪, 杜运兴, 周芬, 李艳秋, 史雄刚, 熊征. 工业废渣复合固化洗砂泥的强度及耐久性研究[J]. 硅酸盐通报, 2025, 44(4): 1525-1534.

DU Junbiao, DU Yunxing, ZHOU Fen, LI Yanqiu, SHI Xionggang, XIONG Zheng. Strength and Durability of Industrial Waste Slag Composite Curing Sand Washing Sludge[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(4): 1525-1534.

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