Abstract
This paper reports on an experimental study regarding the behavior of steel ring-restrained concrete in response to fire exposure. The study was conducted to enable estimation of thermal stress based on steel ring strain in such concrete under the conditions of a RABT 30 heating curve. The specimens used were made from high-strength concrete (Fc: 80 MPa) restrained using steel rings with thicknesses of 0.5, 8 and 18 mm.
Highlights
Fire represents one of the most severe risks to buildings and concrete structures because it often results in explosive concrete spalling stemming from two phenomena
This paper reports on an experimental study regarding the behavior of steel ring-restrained concrete in response to fire exposure
The study was conducted to enable estimation of thermal stress based on steel ring strain in such concrete under the conditions of a RABT 30 heating curve
Summary
Fire represents one of the most severe risks to buildings and concrete structures because it often results in explosive concrete spalling stemming from two phenomena. The second is the build-up of concrete pore pressure due to vaporization of physically/chemically bound water resulting in tensile loading on the microstructure of the heated concrete [2]. A number of studies have analytically demonstrated that the influence of thermal stress on explosive spalling is greater than that of vapor pressure [3,4,5,6]. The authors previously reported that a method involving the restraint of concrete with steel rings in heat testing can be used to clarify characteristics of thermal stress and explosive spalling behavior [8]. This paper reports on an experimental study regarding the behavior of steel ring-restrained concrete in response to fire exposure. The high-strength concrete specimens (Fc: 80 MPa) used measured 300 × 100 mm and were restrained using steel rings with thicknesses of 0.5, 8 and 18 mm
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