Reduction of Postfire Properties of High-Strength Concrete

Table 3

Residual properties of concrete specimens after cooling to ambient temperature (0 h)—(a).

Property	Temperature level (°C)
	20		230		400		500		600
𝑓𝑐,𝑇 (MPa)	57.6		63.1		51.9		38.6		25.4
	65.7	Mean; 63.6	57.6	Mean; 60.4	49.9	Mean; 51.6	38.1	Mean; 39.1	27.9	Mean; 26.3
	67.6		60.6		53.0		40.6		25.5
𝐸𝑠𝑐,𝑇 (MPa)	37694		30365		18244		13430		10078
	37098	Mean; 38159	26214	Mean; 28463	16876	Mean; 17570	11508	Mean; 12624	11377	Mean; 10289
	39684		28809		17589		12932		9413
𝐸𝑐,𝑇 (MPa)	41056		33925		18055		13173		12259
	45484	Mean; 44127	29166	Mean; 32258	16255	Mean; 16955	11232	Mean; 12332	13295	Mean; 12599
	45842		33681		16555		12592		12244