The Effect of High Elevated Temperatures on Nano Silica High Strength Concrete [NSHSC]

The research aim is studying high elevated temperatures influence on NSHSC compressive strength . Effects of nanosilica (NS) content and several elevated temperatures [200, 400 and 600°C] At 2hours heat exposure time were studied. A constant water/binder equals to 0.40 and a constant binder content =500kg/m3 were used. NS percentages that replaced cement in this study were 0,1%,2% and 3%. 96 cubes 10x10x10 cm were examined under compressive loads. They were divided as following, 24 cubes without (NS)as a reference and 72 cubes were cast to study NS content effect at several high temperatures. It was found that, at high elevated temperatures the NS content posses a large influence on improvement high strength concrete [HSC] performance.