The internal concrete structure will have complex physical and chemical change when fire and other high temperature conditions, and which will lead to the mechanics properties such as compressive strength, tensile strength and elastic modulus change. The change of the mechanical properties will influence the safety use of structure. It is necessary to take measures to improve its mechanical capacity in high temperature, nowadays, the common methods adopted in domestic and abroad are adding steel fiber or polypropylene fibber into the concrete to change the characteristics of gelled material, a...
