International Journal of Engineering and Technology

The micro crack growth behaviour on the post-fire concrete reinforced concrete (RC) beams is investigated. The present study found that the burning temperature affects the micro crack width behaviour on the post-fire concrete. The burning temperature of 400oC increases the strength of the post-fire concrete in comparison to the strength of the unburned concrete as indicated by the increasing of the load required to advance the micro crack width. As the burning temperature is increase, the load required to advance the crack is decrease, even when the burning temperature reaches as high as 800oC, the effect of the burning temperature is profound to reduce the concrete strength. The increasing and decreasing of the post-fire concrete associates with the microstructure and the chemical compound of cement.