摘要
基于相似材料配比的正交试验方案,制备了不同成分和配合比的相似材料试样,量测了各试样的导热系数值,研究了相似材料中含水率、胶结物及砂胶比等变化对导热系数量值的影响。研究结果表明:由于水和空气的导热系数差异较大,试样中含水率变化对导热系数量值的影响显著;胶结物在试样中所占比例小,其成分因水化引起的孔隙率变化有限,胶结物成分和配比变化对导热系数量值的影响可以忽略;受砂与胶结物之间的相互作用,胶结物成分和配比方案将改变砂胶比对导热系数量值的影响。当胶结物成分为石灰和石膏时,影响导热系数值的因素依次为含水率、砂胶比和胶结物,并随着砂胶比的增大,导热系数值在增加,但增幅逐渐减小;当胶结物成分为水泥和石膏时,影响导热系数值的因素依次为含水率、胶结物和砂胶比,但随着砂胶比的增大,导热系数量值变化可以忽略。
On the basis of the orthogonal experimental design of the ratio of similar materials,this paper prepares different composition and different mix ratios of similar material samples,and measures the thermal conductivity values of each sample.It examines the influences of the changes of moisture content,cement and sand-binder ratio upon the values of thermal conductivity. The results show that the change of moisture content in the samples has a significant impact on the value of thermal conductivity due to the significant difference between the respective thermal conductivity of water and air. The influence caused by the change of cement composition and ratio on thevalues of thermal conductivity can be ignored since the cement only accounts for a small proportion in the samples and the change of porosity is slightly caused by hydration. Under the interaction between sand and cement,cement composition and ratio can influence the effect of sand-binder ratio change upon thermal conductivity. When the cement consists of lime and gypsum,the factors affecting thermal conductivity are moisture content,sand-binder ratio,and cement composition. As the sand-binder ratio increases,the value of thermal conductivity can rise at a gradually decreasing growth rate. Yet when the cement consists of cement and gypsum,the factors affecting thermal conductivity are moisture content,cement composition,and sand-binder ratio. The change in thermal conductivity can be ignored as the sand-binder ratio increases.
出处
《工程地质学报》
CSCD
北大核心
2015年第5期821-826,共6页
Journal of Engineering Geology
基金
国家自然科学基金资助项目(51004104
51104084)
地质灾害防治与地质环境保护国家重点实验室开放基金资助项目(SKLGP2012K025)
中国博士后基金资助项目(20100481175)资助
关键词
模型试验
导热系数
砂胶比
含水率
胶结物
Simulation experiment,Thermal conductivity,Sand-binder ratio,Water content,Cement
