Abstract
Numerical Simulation of the Ion Transport Behavior in Concrete under Coupled Axial Loading and Sulfate Attack
Highlights
Sulfate formation is widely distributed in China [1]
A chemical-mechanical coupling method for accurately evaluating the transport behavior of sulfate ions in concrete under stress conditions was proposed in this study to investigate the transport characteristics of these ions
The diffusion-reaction equations of sulfate ions were obtained based on the diffusion-reaction approach in combination with the mechanism of volume expansion under a sulfate attack and the influence of load on the concrete voidage
Summary
Sulfate formation is widely distributed in China [1]. Given the various forms of pores in concrete, sulfate ions can enter the interior of concrete and react with its components to form ettringite; this phenomenon causes expansion and cracking in concrete and decreases the strength and bearing capacity of a concrete structure [2]. Sulfate attack, which is regarded as complicated and hazardous erosion, is one of the important factors influencing the durability of underground concrete structures. This process is an important part in the study of the durability of concrete [3]. Sulfate attack on concrete is a complex physicalchemical-mechanical process under the coupling of ion diffusion, chemical reaction, and mechanical damage. Various factors are involved in the sulfate attack on concrete. The high coupling degree between these factors poses a great challenge to the study of the durability of concrete during a sulfate attack
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