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我县一些住宅工程楼地面由预制改为现浇,出现了窗台八字裂缝、楼面裂缝及顶层墙体裂缝等现象,现分述有关质量通病于下。一、斜裂缝及现浇混凝土楼面的裂缝1.原因分析引起窗台下墙体斜裂缝及现浇混凝土楼面裂缝的原因,可归结为以下几个方面。(1)由于混凝土本身收缩引起的裂缝:因为混凝土在空气中凝结硬化时体积缩小,当其四周固结不能自由收缩时,会产生拉应力而
Some residential project buildings in our county were converted from prefabricated to cast-in-place, and there were phenomena such as cracks in window sills, floor cracks, and cracks in the top wall, which are related to quality problems. First, oblique cracks and cast-in-place concrete floor cracks 1. Analysis of the reasons caused by the windowsill oblique cracks and cast-in-place concrete floor cracks, can be attributed to the following aspects. (1) Cracks due to shrinkage of the concrete itself: Since the concrete shrinks in volume when air condenses and hardens, tensile stress occurs when the concrete is not free to contract around it.