Numerical simulation on time-dependent mechanical behavior of concrete under coupled axial loading and sulfate attack. (15th September 2017)

• Record Type: Journal Article
• Authors: Yin, Guang-Ji; Zuo, Xiao-Bao; Tang, Yu-Juan; Ayinde, Olawale; Wang, Jia-Lin
• Is Part Of: Ocean engineering. Volume 142(2017)
• Page Start: 115
• Page End: 124
• Publication Date: 2017-09-15
• Subjects: Concrete -- Sulfate attack -- Chemical damage -- Stress redistribution -- Bearing capacity degradation; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2017.07.016
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: This paper numerically simulates time-dependent mechanical behaviors, such as stress redistribution and bearing capacity degradation, of concrete subjected to the coupled axial loading and sulfate attack. Based on Fick's law and chemical reaction kinetics, a diffusion-reaction model was proposed to obtain the spatial and time-dependent concentration distribution of sulfate ion, gypsum and ettringite. From previous study, a chemical damage, characterized by the volumetric expansion from ettringite formation, is introduced to reflect the influence of sulfate attack on concrete performance. Furthermore, using the plasticity theory and damage mechanics, a coupled chemo-mechanical damage constitutive model was determined by introducing the chemical damage. Finally, a concrete prism is regarded as a research object, to investigate the time-dependent stress and bearing capacity degradation of concrete structures subjected to the coupled axial compression and sulfate attack. Highlights: The stress and capacity of concrete under axial loading and sulfate attack is studied. The chemical damage degree related to the ettringite formation is established. A coupled chemo-mechanical damage constitutive model for concrete is obtained. This work evaluates the durability of concrete structures in marine environment.