基于响应面法的地聚合物注浆材料配合比优化及其微观结构分析  

Mix Proportion Optimization and Microstructure Analysis for Geopolymer Grouting Material Based on Response Surface Methodology

作　　者：范利丹[1,2] 杨杰 余永强 张纪云[1] 唐金召 苏洲虎 FAN Lidan;YANG Jie;YU Yongqiang;ZHANG Jiyun;TANG Jinzhao;SU Zhouhu(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China;International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention,Jiaozuo 454003,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454003 [2]河南省地下空间开发及诱发灾变防治国际联合实验室,河南焦作454003

出　　处：《工业建筑》2023年第6期194-201,共8页Industrial Construction

基　　金：国家自然科学基金项目(52208244);河南省科技攻关项目(212102310974,222102320034)。

摘　　要：地聚合物注浆材料作为低碳材料取代高能耗水泥基浆材应用于隧道注浆加固工程具有重要的现实意义。为合理设计矿渣基地聚合物注浆材料配合比,揭示碱激发反应作用机制,首先通过单因素试验确定粉煤灰的掺量,在此基础上以激发剂模数、浓度和液固比为自变量,浆体抗压强度为响应目标值,采用响应面中心复合设计法,建立地聚合物浆体的二次抗压强度预测模型,并对模型进行显著性分析、方差分析以及响应面综合分析,并结合XRD、SEM和FT-IR对地聚合物的反应产物组成和微观结构进行研究。结果表明:用响应面法能较为准确地对地聚合物注浆液配合比进行优选,激发剂浓度是影响抗压强度的最主要因素,且激发剂浓度和液固比之间的交互作用显著。碱激发矿渣-粉煤灰体系出现C-(A)-S-H、N-A-S-H多凝胶共存的现象,凝胶相的凝结硬化为浆体提供强度;随着龄期的延长,凝胶含量增加,体系微观结构更加致密,宏观力学性能进一步提升。综合考虑浆体强度发展和施工性能,得出矿渣和粉煤灰用量为9∶1,激发剂模数和浓度分别为1.2、15%,液固比为0.6时,地聚合物注浆材料综合性能最优。研究可为地聚合物注浆材料的工程应用提供参考和借鉴。It is of great significance for geopolymer grouting material as a low-carbon material to replace high energy consumption cement-based grouting material in tunnel reinforcement engineering.In order to reasonably design the ratio of slag-based geopolymer grouting material and reveal the mechanism of alkali-activated reaction,firstly the ratio of fly ash was determined through single factor experiment,then the response surface methodology and central composite design were applied for establishing the prediction models of compressive strength for geopolymer grouting material.In the design,alkali activator modulus,alkali activator concentration and liquid-solid ratio were taken as independent variates,and the compressive strength of cementation body as the response values.The quadratic prediction equations of compressive strength were established and verified through significance analysis,variance analysis and the comprehensive analysis of response surface figure,and XRD,SEM and FT-IR methods were applied to analyze the component and microstructure of geopolymer.The results showed that the response surface method was more accurate to optimize the ratio of geopolymer injection paste.The concentration of activator became the most important factor affecting the compressive strength,and the interaction between activator concentration and liquid-solid ratio was significant.The coexistence of C-(A)-S-H and N-A-S-H multi-gels appeared in the alkali-activated slag-fly ash system.The coagulation and hardening of the gel phase provided strength for the harden paste.With the extension of the age,the gel content increased,the microstructure of the system became denser,and the macroscopic mechanical properties were further improved.Considering the development of slurry strength and construction performance,it was concluded that when the dosage of slag and fly ash was 9∶1,the modulus and concentration of activator were 1.2 and 15%,respectively,and the liquid-solid ratio was 0.6,the comprehensive performance of geopolymer grouting

关 键 词：地聚合物 响应面法 配合比优化 抗压强度 微观结构 

分 类 号：U454[建筑科学—桥梁与隧道工程]