水泥
材料科学
复合材料
法律工程学
硫酸盐
胶凝的
抗压强度
岩土工程
工程类
冶金
作者
Raphaël Tixier,Barzin Mobasher
出处
期刊:Journal of Materials in Civil Engineering
[American Society of Civil Engineers]
日期:2003-08-01
卷期号:15 (4): 314-322
被引量:104
标识
DOI:10.1061/(asce)0899-1561(2003)15:4(314)
摘要
A study is presented to predict the degradation of cement-based materials due to external sulfate attack. Parameters of the model are chosen based on the mix design parameters, degree of hydration, and exposure conditions of concrete. A solution of the diffusion equation with a term for a second-order chemical reaction is proposed to determine the sulfate concentration and calcium aluminate profile as a function of time and space. The crystallization pressure of hydration products such as ettringite can lead to internal stresses. Using the volumetric information, the model predicts the generation of internal stresses, evolution of damage, reduction in stiffness, and thus expansion of a matrix phase. The theoretical expansion-time responses are obtained and compared with a variety of available data in the literature. The most important parameters are the w/c ratio, internal porosity, diffusivity of the cracked and uncracked material, and available calcium aluminates. The importance of controlling the pH of the test solution is clearly observed. Model simulations indicate a reasonable agreement with experimental expansion-time data available in the literature.
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