基于质量扩散理论再生骨料混凝土水分迁移有限元分析  

Finite Element Analysis of Moisture Migration of Recycled Aggregate Concrete Based on Mass Diffusion Theory

作　　者：郭远臣[1] 孙可伟[1] 孙岩[1] 

机构地区：[1]昆明理工大学固体废弃物资源化国家工程研究中心,云南昆明650093

出　　处：《昆明理工大学学报（理工版）》2010年第3期38-44,共7页Journal of Kunming University of Science and Technology(Natural Science Edition)

基　　金：国家财政部产业技术成果转化专项基金计划项目(财建[2007]475号)

摘　　要：采用ABAQUS有限元软件质量扩散模块,对再生骨料混凝土材料在标准干燥条件(环境湿度H=60%下,温度T=20℃)内部水分迁移进行了试验研究和有限元分析.研究表明:计算值和试验结果吻合得较好,为后续的再生骨料混凝土干缩应力的分析打下了初步基础;随着干燥龄期的发展,水分的蒸发首先从再生骨料混凝土表面开始,并迅速达到平衡值,然后逐渐扩展到再生骨料混凝土的内部,扩展的速度极其缓慢,最终达到与环境湿度平衡,而且在扩散过程中,水分浓度呈梯度分布;粉煤灰和膨胀剂的添加均减小了再生骨料混凝土水分扩散的速率.Using the mass diffusion module of ABAQUS, the experimental study and finite element moisture migration behavior of recycled aggregate concrete are carried out under the standard drying analysis of conditions （ Ambient humidity, H = 60% ; Temperature, T = 20℃）. The results indicate that the calculated value matches well with the experiment results, which provides a basis for the study of the drying shrinkage stress in recycled aggregate concrete. As the dry age grows, the evaporation of water begins from the surface of recycled aggregate Concrete first, and reaches the equilibrium value rapidly; then the evaporation gradually extends to the interior, but quite slowly, and eventually reaches the equilibrium value of the ambient humidity. In this diffusion process, the concentration of moisture presents gradient distribution. The addition of fly ash and expansive agent reduces the diffusion rate of moisture in recycled aggregate concrete.

关 键 词：再生骨料混凝土 质量扩散 水分蒸发 有限元分析 混凝土开裂 

分 类 号：TU502[建筑科学—建筑技术科学]