国道主干线江西南昌绕城公路乐化至温家圳段一盖板涵洞混凝土的火灾持续时间约10h。最高温度近1000℃。混凝土的损伤是不均匀的,根据残留受火混凝土的颜色、裂隙发育特征及疏松程度,将其损伤程度划分为轻度损伤、中等损伤、严重损伤和破坏4个等级,依此判别其残余强度。混凝土的局部损伤特征受火灾发生时的火源、燃料供给、受火区段的地形、通风等因素的影响。 State Road main road Nanchang, Jiangxi Province Ring Road to Wenhua section of a cover culvert concrete fire duration of about 10h. The maximum temperature of nearly 1000 ℃. The damage of concrete is non-uniform. According to the color of residual fire-affected concrete, the development characteristics of cracks and the degree of looseness, the damage degree of concrete is divided into four grades: mild damage, moderate damage, serious damage and damage, . The local damage characteristics of concrete are affected by such factors as fire source, fuel supply, topography of the fire zone and ventilation.