低温环境水泥基材料残余孔结构研究  

Study on residual pore structure of cement-based material at low temperature

作　　者：张楠[1] 廖娟[1] 吴树勤[2] 姜会浩[2] 张涛[1] 戢文占 蒋正武[3] 

机构地区：[1]中国建筑股份有限公司技术中心,北京101300 [2]中国建筑第二工程局有限公司,北京100054 [3]同济大学先进土木工程材料教育部重点试验室,上海200092

出　　处：《混凝土》2013年第4期29-31,36,共4页Concrete

摘　　要：水泥基材料中的孔溶液在低温环境下会结冰固化,在起到"微集料填充作用"的同时,材料内部的残余孔隙率也发生变化,这是力学强度随温度降低和含水率增加而不断提高的原因。目前,由于没有合理的方法对低温环境下水泥基材料的残余孔结构进行表征,使得在水泥基材料低温强度与残余孔结构关系方面的研究还较少。利用热孔计法理论在0～-40℃范围内对不同水灰比的水饱和硬化水泥石进行研究,发现随温度下降,残余孔体积都出现不同程度的下降,最大孔径不断减小。而同一温度下,水灰比越大,残余孔体积越大,孔径分布比例越大。At low temperature, solidification of pore solution in cement-based material could change its residual porosity as well as result in micro-aggregate filling.It is the reason why mechanics properties are improved with the decreasing of temperature and increasing of moisture.At present, it was rarely studied to the relation between mechanics properties and residual pore structure of cement-based materials at low temperature.According with theory of the rmoporomentry,it studied residual pore structure of water-saturated hardened cement pastes with different water/cement ratio at the temperature range from 0 to -40 ℃.The results showed that the residual pore volume and the largest pore size of all samples were decreasing in different degree with lower temperature.At same temperature, the greater water/cement ratio, the more residual pore volume, the larger proportion of pore distribution.

关 键 词：低温环境 残余孔体积 水泥基材料 热孔计法 孔径分布 

分 类 号：TU528.01[建筑科学—建筑技术科学]