EFFECT OF THE MESOSCOPIC DAMAGE ON THE PERMEABILITY OF CONCRETE
Damage in concrete leads to the generation of many microcracks and deterioration of performance of the concrete. At the same time, the substance diffusion in concrete will accelerate as the increase of microcracks which provide additional diffusion channels. In this paper, concrete is regarded as a composite consisting of coarse aggregate, mortar and interfacial transition zone. Column-shaped aggregates were put into the mortar in order to measure the chloride diffusion coefficient of each component using the Rapid chloride permeability test (RCPT) (ASTM C1202-91). After the specimens with different damages due to the uniaxial compression were tested in RCPT, the relationship between diffusion coefficient and the damage variable of concrete was established. Three-dimensional aggregate distribution model was created from a series of cross sections extending in the direction of the axis of concrete specimen. Finally the Lubliner elasto-plasticity damage model was applied to simulate the mesoscopic damage evolution and the Nernst-Planck law was simultaneously applied to simulate the migration of chloride in damaged concrete. It is shown that the concentration of chloride increases with the damage which leads to an increase of the apparent diffusion coefficient of concrete.
concrete permeability damage rapid chloride permeability test
Ke-Yu Wei Hai-Bo Lu Yan-Lin Zhao
Research Institute of Preventing and Mitigating Disasters, College of Civil Engineering, Guangxi Uni Research Institute of Preventing and Mitigating Disasters, College of Civil Engineering, Guangxi Uni
国际会议
广州
英文
1146-1152
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）