基于正交试验制备生土基复合墙体材料及其热湿综合性能分析  

Hygrothermal Comprehensive Property of Soil Based Composite Wall Materials Prepared with Orthogonal Experimental Design

作　　者：张磊 桑国臣[1] ZHANG Lei;SANG Guochen(School of Civil Engineering and Architecture,Xi an University of Technology,Xi an 710048,China;State Key Laboratory of Green Building in Western China,Xi an University of Architecture and Technology,Xi an 710055,China)

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048 [2]西安建筑科技大学省部共建西部绿色建筑国家重点实验室,陕西西安710055

出　　处：《建筑材料学报》2020年第2期372-380,共9页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51678482);省部共建西部绿色建筑国家重点实验室开放基金资助项目(LSKF201912)。

摘　　要：基于正交试验设计,以石灰和粉煤灰为改性剂制备了生土基复合墙体材料.通过多元非线性回归,分析研究了改性剂掺量和含水率对生土基复合墙体材料热湿综合性能的影响,并得到生土基复合墙体材料的优化配方.结果表明:改性剂掺量和含水率对生土基复合墙体材料热湿综合性能的影响显著,敏感程度依次为含水率>粉煤灰掺量>石灰掺量>空白因素;生土基复合墙体材料的优化配方为石灰掺量6.24%+粉煤灰掺量8.93%+含水率13.57%,此时其导热系数为0.721W/(m·K),平衡含湿量为7.645%,且抗压强度和耐水性均满足相应要求.通过墙体材料组成结构分析和微观形貌分析可知,粉煤灰在碱性环境中的水化作用使得优化生土基复合墙体材料内部呈现出更加致密的结构体系.Soil based composite wall material was prepared with orthogonal experimental design, and lime and fly ash were used as the stabilizers. The effect of stabilizer content and moisture content on hygrothermal comprehensive property of soil based composite wall material was studied by multivariate nonlinear regression, then the optimal preparation parameters for soil based composite wall material were obtained. The results indicate that hygrothermal comprehensive property is significantly influenced by stabilizer content and moisture content. Significance order is moisture content>fly ash content>lime content>blank factor. The optimal preparation parameters were proposed that lime content is 6.24%, fly ash content is 8.93%, moisture content is 13.57%. Thermal conductivity and equilibrium moisture content of optimal soil based composite wall material were 0.721 W/(m·K) and 7.645%, respectively. Tested results show that optimal program has the acceptable compressive strength and water resistance. The composition and microstructure analysis results indicated that hydration products of fly ash enhance the matrix of optimal soil based composite wall material to be a more dense structural system under the effect of alkaline excitation.

关 键 词：正交试验 生土基复合墙体材料 热湿综合性能 组成结构 微观形貌 

分 类 号：TU332[建筑科学—结构工程]