基于响应曲面法的煤矸石地聚物注浆材料配比优化  

Optimization of Grouting Material Proportion of Coal Gangue Geopolymer Based on Response Surface Methodology

作　　者：周梅[1,2] 白金婷 郭凌志 张玉琢 ZHOU Mei;BAI Jinting;GUO Lingzhi;ZHANG Yuzhuo(College of Civil Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Liaoning Provincial Key Laboratory of Coal Gangue Resource Utilization and Energy-saving Building Materials,Fuxin 123000,Liaoning,China;College of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000 [2]辽宁省煤矸石资源化利用及节能建材重点实验室,辽宁阜新123000 [3]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《材料导报》2023年第20期119-127,共9页Materials Reports

基　　金：国家自然科学基金联合基金资助项目(U1261122);国家自然科学基金青年基金资助项目(51808352);辽宁省教育厅科学技术项目(LJ2019FL006);辽宁工程技术大学学科创新团队资助项目(LNTU20TD-12)。

摘　　要：以机械活化的原状煤矸石、粉煤灰和水泥为主料,水玻璃、氢氧化钠和脱硫石膏为激发剂配体,制备煤矸石地聚物注浆材料(CGGM)。采用响应曲面法中的Box-Behnken设计,研究煤矸石粉掺量、水玻璃模数和掺量对CGGM流动性、凝结时间和抗压强度的影响并揭示强度形成机理,构建回归模型,探究各因素及它们之间交互作用的影响程度,获得综合性能最佳配比。结果表明:三因素对各响应值影响显著部分交互项影响显著,各因素与响应值呈二次多项式模型,各模型回归系数R 2皆大于0.99,模型合理性和拟合性好。煤矸石粉和粉煤灰的微集料效应对前期强度有一定贡献,随着龄期延长,二者在激发剂配体作用下发生了聚合反应,生成C-(N)-S-A-H凝胶等,故CGGM强度形成主要来自C-S-H、AFt和C-(N)-S-A-H。当煤矸石粉掺量40%、水玻璃模数和掺量分别为1.6和12.2%时,CGGM的各项性能基本满足矿井高承压水害治理要求。Coal gangue geopolymer grouting material(CGGM)was prepared with mechanically activated coal gangue,fly ash and cement as main materials,sodium silicate,sodium hydroxide and desulfurization gypsum as activator ligands.The Box-Behnken design of response surface methodology was used to study the effects of coal gangue powder content,sodium silicate modulus and content on the fluidity,setting time and compressive strength of CGGM and reveal the formation mechanism of strength.The regression model was constructed to explore the influence of various factors and their interaction,and the optimal ratio of comprehensive performance was obtained.The results show that the three factors have a significant influence on each response value,and there are some interaction items.Each factor and the response value show a quadratic polynomial model,and the regression coefficient R 2 of each model is greater than 0.99.The rationality and fitting of the model are good.The micro-aggregate effect of coal gangue powder and fly ash has a certain contribution to the early strength.With the prolongation of age,the polymerization reaction occurs between them under the action of activator ligand,producing C-(N)-S-A-H gel,etc.Therefore,the formation of CGGM strength mainly comes from C-S-H,AFt and C-(N)-S-A-H.When the coal gangue powder content is 40%,the sodium silicate modulus and content are 1.6 and 12.2%,and the performance of CGGM basically meets the control requirements of mine high-pressure water damage.

关 键 词：煤矸石 地聚物注浆材料 响应曲面法 配比 激发剂 

分 类 号：TU472[建筑科学—结构工程]