胶凝/生土复合材料的制备及热湿综合性能表征

摘要

以矿渣、石灰、水泥、石膏等胶凝材料作为改性剂来制备胶凝/生土复合材料,采用防护热板法和等温吸放湿法测试了胶凝/生土复合材料的热湿性能.结果表明,胶凝材料的种类和掺量对胶凝/生土复合材料的热湿性能影响显著.采用归一法对胶凝/生土复合材料进行热湿性能综合分析,可知,10%石膏/生土材料具有最优的热湿综合性能,这是由于石膏水化硬化作用在生土材料中形成了起到骨架支撑作用的网状结构,网状结构中存在的孔隙降低了材料的导热系数,提升了其吸湿性能.%Slag,lime,cement and gypsum were used as the cementitious agents to prepare the cementitious agent/soil composites.The hygrothermal properties of the cementitious agent/soil composites were investigated by guarded hot plate method and isothermal absorption and desorption method.The test results present that both cementitious type and content have significant effect on the hygrothermal properties of the cementitious agent/soil composites. Hygrothermal properties of the cementitious agent/soil composites were comprehensively analyzed by normalization method,the results show that 10% gypsum/soil composite has the best hygrothermal comprehensive property.The reason is that a mesh structure,which provides a structural supporting in the matrix,is formed by hydration of gyp-sum.The pores,which existe in the mesh structure,decrease the thermal conductivity of the cementitious agent/soil composites and increase the absorption property.