This study is a basic studies for estimating the temperature history of the concrete after a fire. In this study measured the carbonation depth after fire resistance tests. As a result, according to the existing fire damage diagnostic methods, carbonation depth must be than 5cm. However, the actual measured carbonation depth was 1.5 ~ 3.3cm.

To evaluaiton of heat history and spalling of concrete conlmn exposed to high temperature, □300×300×H450mm Specimen was used. fiber condition is Nylon 0.15vol.%, Polypropylene 0.1vol.% and steel fiber 0.3vol.%. The type of find aggregates are silica sand, wash sand and slag sand.