MODELING AND SIMULATION OF CONCRETE DETERIORATION SUBJECTED TO EXTERNAL SULFATE ATTACK
In order to estimate theoretically the deterioration of concrete under sulfate attack, a chemo-mechanical model is proposed to simulate the response of concrete exposed to external sulfatesolutions.The nonsteady diffusion equation of sulfate ion, in which chemical reactionsdepleting sulfate ion concentration in the concrete are considered during diffusion, ispresented firstly. Based on the chemical reactions between sulfate and aluminates, theexpansion strain due to the growth of the reaction product resulting in the damage and thefailure of concrete is calculated. And then, a simplifed mechanical model describing thechanges of the expansion strain and stress in concrete due to the product growing is proposed,and Drucker-Prager criterion is used to evaluate the yield failure of concrete caused byexpansion stress. Finally, numerical simulation is used to analyze the concrete deteriorationunder sulfate solution, and results show that the model can predict the responses of concretewith the diffusion time, such as sulfate ion concentration distribution, expansion strain andstress, and yield failure process of concrete due to the chemical product growing.
Xiao-Bao Zuo Wei Sun
Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing 211189,China;Departmen Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing 211189,China
国际会议
南京
英文
1083-1092
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）