Evaluating Residual Mechanical and Physical Properties of Concrete at Elevated Temperatures

This paper presents the results of an experimental 
study on the effects of elevated temperature on compressive and 
flexural strength of Normal Strength Concrete (NSC), High Strength 
Concrete (HSC) and High Performance Concrete (HPC). In addition, 
the specimen mass and volume were measured before and after 
heating in order to determine the loss of mass and volume during the 
test. In terms of non-destructive measurement, ultrasonic pulse 
velocity test was proposed as a promising initial inspection method 
for fire damaged concrete structure. 100 Cube specimens for three 
grades of concrete were prepared and heated at a rate of 3°C/min up 
to different temperatures (150, 250, 400, 600, and 900°C). The results 
show a loss of compressive and flexural strength for all the concretes 
heated to temperature exceeding 400°C. The results also revealed that 
mass and density of the specimen significantly reduced with an 
increase in temperature.

 





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