Abstract
Safety of concrete structures could be threatened under fire exposure, especially for structures under hygrothermal environment. Existing studies have shown that concrete contains large amount of moisture could induce spalling failure and the temperature is a critical parameter for the damage. However, until now, the study for heat transfer of concrete with different saturation degree remains limited. In this paper, the temperature increase of concrete specimens with different saturation degree is experimentally studied. Results show that the temperature increase rate could be affected by the moisture content significantly, especially for the cases under higher temperatures. The test results could be significant for our future fire damage simulation of concrete structures under hygrothermal environment.
Highlights
High temperature may induce concrete peeling off or even burst when it subjected to hot and humid environment[1~5], which can threaten the safety of concrete structures, as well as people's lives and property
Many researchers concerned the influence of water content on the mechanical properties of concrete members under high temperature[6~11], the results remain limited and it is rather difficult to carry out accurate numerical simulation
From the results and discussions, the following conclusions can be reached: For concrete with different saturations subjected to withstand high temperaturethe higher saturation degree is, the lower temperature is at the concrete surface
Summary
High temperature may induce concrete peeling off or even burst when it subjected to hot and humid environment[1~5], which can threaten the safety of concrete structures, as well as people's lives and property. For simulation of temperature field in concrete, the influence of moisture is usually neglected, which may result in inaccurate evaluation. Many researchers concerned the influence of water content on the mechanical properties of concrete members under high temperature[6~11], the results remain limited and it is rather difficult to carry out accurate numerical simulation. The correction value is empirical and the relationship between the correction value and the moisture content is not clear. It requires further investigation on the influence of moisture effect on the temperature field. The results could be beneficial to fast and effective evaluation of fire-damaged concrete structures under hygrothermal environment
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