Effect of load on thermal spalling of reinforced concrete containing various mineral admixtures

Abstract

Abstract. The present experimental program was planned to investigate the effect of type of mineral admixture, pre-load and the presence of confining reinforcement on the spalling behaviour of heated high performance concrete (HPC). Reinforced concrete cylindrical short columns were cast and exposed to four different target temperatures. A compressive preload equal to 25% of the ultimate load capacity of column was maintained on the specimens during heating and cooling. The test results mainly focus on the influence of above said variables on spalling behaviour of reinforced HPC columns. Interesting observations have been made in the paper on the subject matter of the workshop.

Fire spalling behavior of high-strength concrete: A critical review

“…Furthermore, HSC mixed with SF is more prone to spalling than HSC combined with FA and blast furnace slag [144,145]. The problem of building spalling has been recognized for decades, but it has recently been emphasized in Europe owing to the recent intense tunnel fires [122,146].…”

“…Different concrete kinds have different densities and pore structures, but the temperature gradients created during heating are identical [2]. Significant studies have been conducted to generate more knowledge about the performance of several types of concrete, including the mechanism of spalling and behavior during fire [2,12,70,144,163,167,172]. In addition to considering AACs, a more environmentally friendly binder than OPC [124,133,248],…”

An experimental evaluation to determine the required thickness of passive fire protection layer for high strength concrete tunnel segments

“…Being a homogenous material under mechanical actions, concrete behaves as a heterogeneous material under thermal actions [2,4,5]. Spalling has been observed to occur within a wide temperature interval as low as 300°C [6] and as high as 500°C [7]. Spalling occurs because of the development of internal stresses surpassing the direct tensile strength of concrete.…”

“…On the other hand, the amount of compressive loading on the fire-exposed element determines the extent and depth of spalling [7]. High strength concrete elements can carry greater loads per unit area than elements composed of normal strength concrete.…”