Modeling and simulation of concrete deterioration subjected to external sulfate attack

Title: Modeling and simulation of concrete deterioration subjected to external sulfate attack
Author(s): X. Zuo, W. Sun
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 1083 - 1092
Total Pages: 10
Nb references: 11
Language: English

Abstract: In order to estimate theoretically the deterioration of concrete under sulfate attack, a chemomechanical model is proposed to simulate the response of concrete exposed to external sulfate solutions.The nonsteady diffusion equation of sulfate ion, in which chemical reactions depleting sulfate ion concentration in the concrete are considered during diffusion, is presented firstly. Based on the chemical reactions between sulfate and aluminates, the expansion strain due to the growth of the reaction product resulting in the damage and the failure of concrete is calculated. And then, a simplifed mechanical model describing the changes 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 by expansion stress. Finally, numerical simulation is used to analyze the concrete deterioration under sulfate solution, and results show that the model can predict the responses of concrete with the diffusion time, such as sulfate ion concentration distribution, expansion strain and stress, and yield failure process of concrete due to the chemical product growing.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00

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