The Combination of concrete and steel form economical and efficient composite material by means of the created cooperation through bond stress on the interface of both materials. Heating at varying temperature would result in behaviour change of the composite material, particularly regarding its bond stress performance due to the microstructure change of the concrete and steel. The uniaxial compression test indicated that the value of concrete compression strength on seven days if heated at 2000 C , 5000 C, and 8000 C temperature would decrease, varying from six to 100%, whereas the decrease of concrete compression strength on 28 days varying from ten to 90%. At 2000 C heating, the decrease of bond stress between steel and concrete on 28 days was approximately 30%. Heating at a higher temperature or at 5000 C would lead to 40% to 77% decrease. The decrease of concrete compression and that of bond stress due to heating was presented by a non-linear curve
showing that there was a positive correlation between the two characteristics.