This paper reports on an experimental study regarding the behavior of restrained high-strength concrete in response to the type of extreme heating associated with fire. The study was intended to support estimation of thermal stress from the strain in a restraining steel ring and vapor pressure in restrained concrete under the conditions of a RABT 30 rapid heating curve. The size of the specimens was φ300 X 100 mm, and the results showed that explosive spalling occurred between 4 and 10 minutes in terms of heating time. It was also observed that the thermal stress was greater than the vapor pressure value of 0.1 MPa at a point 10 mm from the heated surface at 5 minutes. The maximum spalling depth was about 61 mm. It was inferred that spalling behavior caused by thermal stress may become predominant under restrained conditions.
Tanibe, T., Ozawa, M., Kamata, R. and Rokugo, K. (2014), "Steel Ring-Based Restraint of HSC Explosive Spalling in High Temperature Environments", Journal of Structural Fire Engineering, Vol. 5 No. 3, pp. 239-250. https://doi.org/10.1260/2040-2318.104.22.168Download as .RIS
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