Behavior of recycled construction material concrete against elevated temperatures

Abstract

The main purpose of this research is to study the behavior of recycled concrete as a partial replacement of coarse aggregate against elevated temperatures. (10, 20, 30, 40) % by weight was used for recycled concrete. Concrete samples exposed to temperatures (32, 250, 500) °C for six hours. Mechanical tests such as compressive and tensile strength tests, physical tests such as ultrasonic pulse velocity, bulk density, porosity, specific gravity and water absorption tests were done to the samples after curing in normal water for 28 days and for samples exposed to elevated temperatures. Test results showed slightly degradation in mechanical and physical engineering properties of concrete specimens that cured in normal water, degradation increased with increasing of replacement but test results still closely to reference samples. Noticeable deterioration showed in mechanical and physical properties for both reference and partial replacement samples at (250, 500) °C.