건설재료시공학연구실

Building material & construction lab.

Abstract
In this study, the spalling properties of 100 MPa concrete restrained by ring type steel pipe were evaluated in consideration of heating conditions. Experimental results showed that surface spalling occurred at rapid heating and explosive spalling at low speed heating. It was also found that the water vapor pressure and the restrained stress were different depending on the heating conditions. Particularly, in the case of low-speed heating, it is judged that an explosive spalling occurs because moisture is moved to the central portion due to a low heating rate to form a large water vapor pressure.