Effect of high temperatures on concretes incorporating different aggregates

Abstract
Changes in physical properties of concrete beams and cylinders made with gravel, sandstone, limestone and expanded slag aggregates were studied after exposure to various temperatures ranging from 100 to 800 °C. Results indicated that the residual compressive strength of concrete increased up to 10% when the specimens were heated up to 300°C, whereas the flexural strength decreased 34% with limestone and 55% with gravel aggregate. After 500 ° C exposure, losses in strength of corresponding concretes were 19 to 24% in compression and 58 to 80% in flexure. In temperatures over 500 °C the residual strength of all types of concrete decreased sharply due to dehydration of chemical constituents in the cement paste. Results from the four types of concrete investigated indicate that limestone concrete gave the best performance up to 700°C, at which temperature decomposition of carbonates on the surface of test specimens was observed.

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