基于响应曲面法的三元地聚合物注浆材料耐久性能研究

摘要/Abstract

摘要： 为满足复杂地层条件下隧道同步注浆材料耐久性能要求,以粉煤灰、矿渣、偏高岭土等材料制备三元地聚合物注浆材料,并对其耐久性能进行研究。在探究原料物化性质的基础上,采用响应曲面法中Box-Behnken设计耐久性试验,对试验结果进行显著性分析、方差分析以及三维响应曲面分析,结合XRD、SEM和EDS分析地聚合物结石体的微观形貌和水化产物。结果表明:粉煤灰、偏高岭土和矿渣能形成性能互补效应,三者相互作用对注浆材料的侵蚀系数影响显著,可有效增强其抗硫酸盐离子侵蚀能力;预测确定系数R²_pred为0.932 8,试验相对误差为0.71%,模型精确度高,通过优化获得最佳配合比参数为水泥45.183%(质量分数,下同)、粉煤灰20%、偏高岭土20%、矿渣14.817%;地聚合物注浆材料水化产物主要为方解石、C-A-S-H和N-A-S-H凝胶等物质,这些物质紧密交接,交错生长,形成致密的三维空间网络结构支撑体系,有效增强了材料的耐久性能。研究结果可为三元地聚合物注浆材料耐久性能的后续研究及生产应用提供参考。

关键词: 地聚合物, 粉煤灰, 矿渣, 偏高岭土, 耐久性能

Abstract: To meet the durability requirements of synchronous grouting materials for tunnels under complex geological conditions, ternary geopolymer grouting materials were prepared using materials such as fly ash, slag and metakaolin, and their durability performance was studied. On the basis of exploring the physicochemical properties of raw materials, a durability test was designed using Box Behnken in response surface methodology. The test results were analyzed for significance, variance and three-dimensional response surface methodology. XRD, SEM and EDS were used to analyze the microstructure and hydration products of the polymer stone body. The results show that fly ash, metakaolin and slag can form a complementary effect, and their interaction has a significant impact on the erosion coefficient of grouting materials, which can effectively enhance their resistance to sulfate ion erosion. Prediction determination coefficient R²_pred is 0.932 8, the relative error of the experiment is 0.71%, and the model accuracy is high. Through optimization, the optimal mix ratio parameters are cement 45.183% (mass fraction, the same below), fly ash 20%, metakaolin 20% and slag 14.817%. The hydration products of geopolymer grouting materials are mainly calcite, C-A-S-H and N-A-S-H gel, which are closely connected and grow in a staggered manner, forming a dense three-dimensional spatial network structure support system, effectively enhancing the durability of the materials. The research results can provide reference for the subsequent research and production application of durability performance of ternary geopolymer grouting materials.

Key words: geopolymer, fly ash, slag, metakaolin, durability

中图分类号:

U455

陈士军, 龚木联, 刘溯逸, 花思旭, 金修伟, 王昊. 基于响应曲面法的三元地聚合物注浆材料耐久性能研究[J]. 硅酸盐通报, 2024, 43(3): 938-947.

CHEN Shijun, GONG Mulian, LIU Suyi, HUA Sixu, JIN Xiuwei, WANG Hao. Durability of Ternary Geopolymer Grouting Materials Based on Response Surface Methodology[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(3): 938-947.

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