【摘要】 铜-黄公路涵洞衬砌混凝土在火灾中的损伤特征显示了变色、裂隙发育和逐层剥落的宏观特征。在显微尺度下受损混凝土裂隙的类型及其扩展规律和矿物相变显示了,中等损伤程度下裂隙的扩展和爆裂作用的叠加是衬砌混凝土发生多层剥落的重要原因;受火混凝土颜色的变化主要与矿物相变和微裂隙的形成有关。更多还原

【Abstract】 The damage features of the lining concrete of a culvert in Tong-Huang Highway after conflagration indicate color alteration,fracture developing and multi-layers of spalling.According to the damage features of the fracture types and their developing patterns,and changing of mineral phase transformation under microscopic scale,it is concluded that the superposition between fracturing and explosive spalling plays a key role in the multi-layer damages of the lining concrete.The color alteration of the damaged concrete is mainly related to micro-fracture and mineral phase transformation.更多还原