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普通预制空心楼板板问灌缝开裂问题,是一项长期困扰建筑业的质量通病,主要是由混凝土的干缩徐变、温差应力和空心板本身收缩徐变值偏大造成的。传统的空心板拼缝方式,板间主要靠补灌混凝土的粘结强度维持其应力传递。实验数据表明,经清理凿毛的后浇混凝土粘结面的粘结强度仅为混凝土抗拉强度的1/2左右。当两板承受不同荷载时,会因其挠度不同而被
The problem of common cracking of prefabricated hollow floor slabs is a common problem that has long plagued the construction industry. It is mainly caused by the shrinkage and creep of concrete, the temperature difference stress and the shrinkage and creep of the hollow slab itself. The traditional method of joint seaming of hollow slabs depends mainly on the bonding strength of the supplemented concrete to maintain its stress transmission. The experimental data shows that the bonding strength of the post-concrete adhesive surface of the cleaned gouging is only about 1/2 of the concrete tensile strength. When the two plates are subjected to different loads, they are subject to different deflections.