Multiscale Numerical Simulation of Expansion Response of Hardened Cement Paste at Dormant Period of External Sulfate Attack

AbstractExpansion of concrete caused by external sulfate attack (ESA) is a multiscale chemomechanical response, mainly including internal stress evolution at the dormant period and significant cracking expansion for a detrimental duration in hardened cement paste (HCP). The internal stress generated...

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Bibliographic Details
Published in:Journal of engineering mechanics 2019-07, Vol.145 (7)
Main Authors: Zuo, Xiao-Bao, Yin, Guang-Ji, Li, Xiang-Nan, Tang, Yu-Juan
Format: Article
Language:English
Subjects:
Cement
Chemical attack
Chemical reactions
Computer simulation
Concrete
Concrete structures
Continuum mechanics
Crack initiation
Crystallization
Cylinders
Ettringite
Fracture mechanics
Mathematical models
Mechanical analysis
Microcracks
Organic chemistry
Reaction kinetics
Residual stress
Supersaturation
Technical Papers
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Summary:AbstractExpansion of concrete caused by external sulfate attack (ESA) is a multiscale chemomechanical response, mainly including internal stress evolution at the dormant period and significant cracking expansion for a detrimental duration in hardened cement paste (HCP). The internal stress generated in the dormant period of ESA can result in the microcracking of HCP and further significant volume expansion of concrete, which can reduce the durability of concrete structures. Based on the ESA-induced expansion mechanism, a multiscale model is developed to describe the expansion response of HCP in the dormant period of ESA. In this model, a saturated and homogeneous HCP and a representative volume element (RVE), which is composed of a pore and nearby cement paste, are regarded as macroscopic and microscopic objects, respectively. By using Fick’s law and reaction kinetics, a diffusion-reaction model is proposed to simulate the macroscopic sulfate diffusion in HCP and microscopic chemical reaction to produce ettringite in RVE. According to the crystallization pressure theory and continuum mechanics, some mechanical models are constructed to investigate the microscopic mechanical response caused by the supersaturation of ettringite in RVE and its induced macroscopic mechanical response in HCP. Taking a HCP cylinder under different sulfate exposures as an example, a numerical simulation is performed to investigate its expansion response in the dormant period of ESA.
ISSN:0733-9399
1943-7889
DOI:10.1061/(ASCE)EM.1943-7889.0001622