基于细观尺度的泡沫混凝土热性能研究  

Meso-scale Study on Thermal Properties of Foam Concrete

作　　者：沈涛[1] 宋来忠[1] 孙艳海[1] 

机构地区：[1]三峡大学理学院,宜昌443002

出　　处：《材料导报》2013年第22期155-159,共5页Materials Reports

基　　金：国家自然科学基金(11171181)

摘　　要：在细观层次上,泡沫混凝土可认为由人工引入的气孔和水泥浆体两相材料复合而成。利用参数化方法,生成大量随机分布的椭圆(椭球),分别建立孔隙率为58%的二维和孔隙率为50%的三维泡沫混凝土数值试件。对二维泡沫混凝土数值试件进行瞬态热学分析,观察热流量在泡沫混凝土内部的传播运动规律,探究了泡沫混凝土的保温隔热机理;模拟稳态平板法测导热系数的工况,对三维泡沫混凝土数值试件进行稳态热学分析,得出试件热面和冷面的温度值,再利用傅里叶定律计算得到泡沫混凝土的导热系数,数值模型计算得到的导热系数与实验测定的导热系数吻合得很好。At the microscopic level, foam concrete can be considered as the two-phase composite materials, in cluding pores and cement paste by artificial introduction. The parametric method was used to generate a large number of randomly distributed ellipses （ellipsoid） and establish the two-dimensional and three-dimensional foam concrete nu merical specimens with the porosity of 58% and 50%respectively. The two-dimensional numerical model was charac-terized by transient thermal analysis, the law of heat flowing in the foam concrete was observed, and the foam concrete thermal insulation mechanisms were discussed. Simulating the steady state plate condition, the temperature of the three-dimensional numerical specimenJs hot and cold surface can be calculated with the steady state thermal analysis, then the coefficient of thermal conductivity of foam concrete was calculated using the Fourier law. The coefficient of thermal conductivity of the numerical model is close to the real sample.

关 键 词：泡沫混凝土 细观模型 热学分析 导热系数 

分 类 号：TU528.2[建筑科学—建筑技术科学]