研究了不同龄期受损混凝土经过相同养护期后的自然愈合现象.混凝土受损后的自愈合实质上是损伤部位未水化或水化不充分的胶凝材料加速水化或进一步水化生成新的水化产物弥合裂缝的过程.以超声波速的变化表征混凝土受压开裂后的损伤程度,建立了混凝土损伤量与愈合状况之间的关系.结果表明,混凝土材料存在一个损伤阈值:当混凝土的损伤低于损伤阈值时,自愈合率随着损伤量的增大而增大;当混凝土损伤超过损伤阈值时,自愈合率随着损伤量的增大而降低.
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