Mechanical Damage Model of Concrete Subject to Freeze-Thaw Cycles Coupled with Bending Stress and Chloride Attack

Abstract:

As the action mechanisms of various factors affecting concrete durability are different, it is difficult to understand the durability of concrete exposed to multiple factors using only mechanism analysis. Converting each action mechanism to an appropriate macroscopic mechanical effect can simplify complicated durability problems. Here we study concrete beams exposed to common environmental factors: cyclic freezing and thawing, bending stress and chloride attack. By converting each mechanism into a mechanical process and analyzing its effect on concrete, a damage model based on strain was established. Freezing-induced tensile stress is essentially a low-cycle fatigue tensile stress, as represented by a saw-tooth model. The maximum strains when the maximum freezing-induced tensile stress coupled with the four-point bending stress in every freeze-thaw cycle were measured, and found to increase with freeze-thaw cycling. Our damage model provides a new approach to predict the service life of concrete, and guidance for durability design of concrete.

• Periodical: Advanced Materials Research (Volume 936)
• Pages: 1342-1350
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.936.1342
• Online since: June 2014
• Authors: Peng Du*, Yan Yao, Ling Wang, Yin Cao
• Keywords: Concrete, Damage Model, Mechanical Analysis, Multiple Factors, Strain

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