【摘要】 铜-黄公路某一涵洞衬砌混凝土的火灾损伤在宏观上显示了典型的逐层剥落现象,遭受多层剥落的混凝土在显微尺度下的损伤特征表明,混凝土的剥落与裂隙的扩展特征和局部爆裂现象有关。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。混凝土的湿度大、火灾温度高且持续时间长是发生多层爆裂损伤的重要条件。更多还原

【Abstract】 The damage features of the lining concrete of aculvert in Tong-Huang Highway after conflagration indicate multi-layers of spalling at several positions.The damage features under microscope show that there is explosive spalling at seriously damaged positions.The superposition between fracturing and explosive spalling plays a key role in the multi-layer damages of the lining concrete.The multi-layer explosive spalling damages depend strongly on the high humidity of the lining concrete,the high temperature and long-time lasting of the fire.更多还原