Influence of coarse aggregate types on fracture properties of concrete subjected to high temperature heating

Abstract

This paper reports on the influence of coarse aggregate types on the fracture properties of concrete subjected to high temperatures up to 800C. The fracture properties were evaluated based on tension-softening curves which were determined by polylmear approximation through inverse analysis. The follow conclusions were found: The initial cohesive stress of concrete containing sandstone, granodiorfte, and chert slightly increased, while those of limestone slightly decreased at 100C, and at higher temperatures, the initial cohesive stress of all specimens decreased. The fracture energy of all specimens increased up to a heating temperature of 300C but then tended to decrease.