基于响应面法的复合固化土配合比优化研究

doi:10.16552/j.cnki.issn1001-1625.2024.0720

摘要/Abstract

摘要： 为改善粉土作为路基材料级配较差、整体结构松散、强度较低等缺点,本文以赤泥(RM)、电石渣(CS)、脱硫石膏(DG)为原材料制备复合固化剂,开展复合固化土配合比优化研究。通过单因素试验分别确定了赤泥、电石渣、脱硫石膏固化土的合理掺量范围,同时借助Box-Behnhen响应面法对复合固化土的配合比进行优化。以7、28 d无侧限抗压强度(UCS)为响应值,建立二阶回归模型。结果表明:单因素对固化土7、28 d无侧限抗压强度影响的显著程度均依次为赤泥、电石渣、脱硫石膏;双因素交互作用对固化土7 d无侧限抗压强度影响的显著程度依次为赤泥和电石渣、赤泥和脱硫石膏、电石渣和脱硫石膏,对28 d无侧限抗压强度影响的显著程度依次为赤泥和电石渣、电石渣和脱硫石膏、赤泥和脱硫石膏。通过优化获得复合固化土的最优配合比为赤泥掺量15.84%(质量分数)、电石渣掺量14.32%(质量分数)、脱硫石膏掺量7.32%(质量分数)。响应值的实测值和预测值误差均较小,证实了响应面法优化复合固化土配合比的精确性和科学性。固化土的主要产物为具有胶凝作用的水化硅酸钙(C-S-H)和水化铝酸钙(C-A-H),生成的钙矾石(AFt)穿插在凝胶与土颗粒之间,增强了土体强度。

关键词: 赤泥, 固化土, 响应面法, 配合比优化, 回归模型, 交互作用

Abstract: In order to improve the poor grading, loose overall structure and low strength of silt as subgrade material, the composite curing agent was prepared with red mud (RM), carbide slag (CS) and desulphurized gypsum (DG) as raw materials, and the mix ratio optimization of composite cured soil was carried out in this paper. The reasonable content range of red mud, carbide slag and desulfurized gypsum cured soil was determined by single factor test, and the mix ratio of composite cured soil was optimized by Box-Behnhen response surface method. A second-order regression model was established with 7 and 28 d unconfined compressive strength (UCS) as response values. The results show that the significant degree of influence of single factor on the unconfined compressive strength of cured soil at 7 and 28 d is carbide slag, red mud and desulphurized gypsum. The influences of two factors on the unconfined compressive strength of cured soil at 7 d is in the order of red mud and carbide slag, red mud and desulphurized gypsum, carbide slag and desulphurized gypsum, and the influence on the unconfined compressive strength at 28 d is in the order of red mud and carbide slag, carbide slag desulphurized gypsum, red mud and desulphurized gypsum. The optimal mix ratio of composite cured soil is 15.84% (mass fraction) red mud, 14.32% (mass fraction) carbide slag and 7.32% (mass fraction) desulphurized gypsum. The error range of the measured and predicted response values is controlled within 3%, which proves the accuracy and scientificity of the response surface method in optimizing the mix ratio of composite cured soil. The main products of cured soil are calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (C-A-H) with gelling effect, and the resulting ettringite (AFt) is interspersed between the gel and soil particles to enhance the strength of soil.

Key words: red mud, cured soil, response surface method, mix ratio optimization, regression model, interaction

中图分类号:

U416.1

张鲲鹏, 张宁, 丁北斗. 基于响应面法的复合固化土配合比优化研究[J]. 硅酸盐通报, 2025, 44(1): 368-377.

ZHANG Kunpeng, ZHANG Ning, DING Beidou. Mix Ratio Optimization Research on Composite Cured Soil Based on Response Surface Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(1): 368-377.

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