Research on the Fatigue Properties of High Strength Concrete after Exposure to High Temperature under Low Cyclic Compressive Loading

Table 2

Appearance characteristics of HSC after exposure to high temperatures and then room temperature cooling.

Temperature: °C	Color	Crack propagation	scaling	Broken edges and corners	Looseness
20	Cinereous	None	None	None	None
200	Cinereous	None	None	None	None
400 (0.5 h, 1 h)	Reddish	Little	Little	Little	Mild
600	Grey	Some	Some	Some	A little heavy
800	Offwhite	Throughout the surface	Mostly	All the cornerS	Heavy