基于响应面法的二元固废地聚物配比优化试验研究  

Response Surface Method-based Experimental Study on Mixing Proportion Optimization for Binary Solid-waste Geopolymer

作　　者：刘子豪 刘俊芳[1,2,3] 崔潮 张天然 LIU Zihao;LIU Junfang;CUI Chao;ZHANG Tianran(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Key Laboratory of University of Geological Hazards and Geotechnical Engineering Defense in Sandy and Drought Regions,Hohhot 010051,China;Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051 [2]沙旱区地质灾害与岩土工程防御自治区高等学校重点实验室,呼和浩特010051 [3]内蒙古工业大学地质技术与岩土工程内蒙古自治区工程研究中心,呼和浩特010051

出　　处：《材料导报》2024年第S02期265-271,共7页Materials Reports

基　　金：国家自然科学基金(52368035)。

摘　　要：以原样煤矸石、矿渣为全固废主料,水玻璃、氢氧化钠为复合激发剂配体,制备煤矸石-矿渣地聚物(CGSG)。基于响应面法中的Box-Behnken设计,研究矿渣掺量、水玻璃模数和NaOH掺量对CGSG浆体流动度、7 d和28 d抗压强度的影响。构建响应面回归模型,分析各因素及其交互作用对浆料流动度及固结体强度的影响,并得到综合性能最佳的配比参数。结果表明各因素与响应值呈二次多项式模型,回归系数R^(2)均大于0.96,模型可靠性强且拟合性好。CGSG对各单一因素响应较敏感,部分因素交互项影响显著。通过模型预测优化获得最佳参数配比为煤矸石含量60%,矿渣掺量40%,水玻璃模数1.56,NaOH掺量8%,此时28 d的水化产物主要为C-A-S-H、N-A-S-H等凝胶类物质,这些物质相互交接、交错叠加,形成致密程度高和骨架构造强的二元固废地聚物注浆材料。本研究的成果拓宽了煤矸石、矿渣固废使用场景,提高了固体废物回收利用率。The coal gangue-slag geopolymer(CGSG)were prepared using original coal gangue and slag as the entire solid waste materials,with sodium silicate and sodium hydroxideacting as complex activator ligands.Employing a Box-Behnken design in response surface method,the experiment investigated the effects of slag content,sodium silicate modulus,and NaOH content on the fluidity,7-day and 28-day compressive strength of CGSG slurry.A response surface regression model was developed to analyze the impact of various factors and their interactions on the fluidity and compressive strength of materials,leading to the determination of optimal ratio parameters.The results indicated that each factor and response value followed a quadratic polynomial model with the regression coefficient R^(2) exceeding 0.96,demonstrating strong reliability and good fitting for the model.CGSG exhibited high sensitivity to individual factors while significant effects were observed from interaction of certain factors.Through prediction and optimization by model,an optimal parameter ratio was determined as:60%coal gangue content,40%slag content,a sodium silicate modulus of 1.56 and NaOH content at 8%.Under these conditions,products after 28-day hydration mainly consisted of C-A-S-H,N-A-S-H,and other gel substances,which were mixed to form a binary full-solid waste polymer grouting material featuring high density and strong skeleton structure.The output of this work broadens potential applications for coal gangue and solid waste from slag while improving recycling rates of solid waste.

关 键 词：原样煤矸石 高炉矿渣 地聚物 响应面法 最优配比 

分 类 号：TU521[建筑科学—建筑技术科学]