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Application of the Stress-wave Methods to Evaluation of the Strength of Concrete After Fire Damage
The strength of concrete is reduced under the heat caused by a fire. The safety of a concrete construction will then be greatly influenced due to the fire damage. In this paper, the relationship between the residual strength of fire-damaged concrete and the residual speed of stress waves is set up, and the feasibility of evaluating residual strength of fire-damaged concrete with the residual speed of stress waves will also be discussed. In experiment, the wave speed in concrete is measured by the ultrasonic-echo method and the impact-echo method. The experimental specimens used in the studies have different parameters as follows: water to cement ratio (W/C), change of temperature, heat duration time as well as post-fire curing condition and ages. According to the result of experimental studies, the decrease in strength of concrete is not significant under heat temperature below 500 ℃. For concrete exposed to a high temperature of 600 ℃, the strength restoration of concrete cured in water is better than that of concrete in the air. In addition, the results show that the relation of the residual wave speed ratio and residual strength ratio varies with different curing conditions. The relationship between the residual wave speed ratio and residual strength ratio for each curing condition is well correlated. After establishing the relationship between the residual speed of stress waves and the residual strength of the fire-damaged concrete, the stress wave speed measurement can be used to evaluate the in-place strength of concrete after fire damage.
|Appears in Collections:||土木工程學系所|
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