Residual strength of Super High Strength Concrete Used Stone-chip after exposure to high temperatures

This paper presents results of experimental study on the residual compressive strength of concrete produced with stone-chip as fine aggregates with compressive strengths ranging from 45.8 to 129.5MPa after exposure to high temperatures, which the experimental parameters being the temperature, admixtures, and PP fiber and specimens being exposed for a period of 4 h to high temperatures ranging from 150 to 960 degrees C. Experimental results showed that the relatives compressive strengths of super high strength concrete used stone-chip(abbreviated to SHSCUS) and normal strength concrete used stone-chip (abbreviated to NSCUS) after exposure to elevated temperatures changed in the manners different to that of normal strength concrete, which reached their peak at about 400 degrees C, and the presence of pp fibers in SHSCUS concrete could reduce the risk of spalling at the high temperatures and the peak value after fire.