Simulations on Expansive Strain of Concrete Caused by Ettringite Growth under Sulfate Attack
In order to assess theoretically the expansive strain of concrete caused by the ettringite formation and growth under the sulfate attack, some models are proposed to investigate the strain responses of concrete exposed to the sulfate solutions. Firstly, an 1-D nonlinear and nonsteady diffusion-reaction equation of sulfate ion in concrete is proposed; Secondly, based on chemical reactions between sulfate and aluminates in concrete, the expansive strain is obtained due to the ettringite growth resulting in concrete expansion. Thirdly, numerical simulations are carried out to analyze the formation process of the concrete expansive strain under the sulfate solution, and results show that the models can be used to predict the concrete responses with the diffusion time, such as the distribution concentration of sulfate ion, dissipated concentration of the calcium aluminates, expansion strain of concrete due to the formation and growth of ettringite.
Guangfan Li, Yong Huang and Chaohe Chen
X. B. Zuo and W. Sun, "Simulations on Expansive Strain of Concrete Caused by Ettringite Growth under Sulfate Attack", Advanced Materials Research, Vols. 250-253, pp. 1906-1911, 2011