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Using Ultrasonic Pulse Velocity to Evaluate Residual Compressive Strength of Post-fire-curing Concrete

Using Ultrasonic Pulse Velocity to Evaluate Residual Compres...

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17th World Conference on Non-Destructive Testing

作者： hsuanchih yang Yiching LIN Chiamen HSIAO Department of Civil Engineering National Chung Hsing University 250 Kuo-Kuang Rd.Taichung 402Taiwan Department of Interior Design National Taichung Institute of Technology129 Sanmin Rd.Sec.3Taichung 404Taiwan

In this paper,the ultrasonic pulse velocity (UPV) is used to quantitatively evaluate the residual compressive strength of post-fire-curing concrete subjected to elevated temperatures.A series of tests were performed to examine the relationship between the residual UPV and strength of post-fire-curing concrete. Cylindrical specimens were made of concrete with various mixture proportions, and heated in an electric furnace to temperatures ranging from 400 to 1000℃with an exposure time of 2 *** exposing to elevated temperatures,the concrete specimens were cooled down in the ambient air or water tank and then cured in water for different curing *** specimens were tested at the 7,30,90 and 180 days after *** each test,the pulse velocity and compressive strength were *** results show that the residual compressive strength of concrete decreases as the exposure temperature increases. In addition,prolonging the water-curing duration and extending the test days will help restore concrete strength ***,a general relationship between the residual strength and UPV ratios can be established to estimate the residual strength ratio of post-fire-curing concrete with a measured residual UPV ratio.

关键词： Residual strength Concrete High temperature Pulse velocity Post-fire-curing

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