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一、干缩裂缝及预防干缩裂缝多出现在混凝土养护结束后的一段时间或是混凝土浇筑完毕后的一周左右。水泥浆中水分的蒸发会产生干缩,且这种收缩是不可逆的。干缩裂缝的产生主要是由于混凝土内外水分蒸发程度不同而导致变形不同的结果:混凝土受外部条件的影响,表面水分损失过快,变形较大,内部湿度变化较小变形较小,较大的表面干缩变形受到混凝土内部约束,产生较大拉应力而产生
First, shrinkage cracks and prevent shrinkage cracks appear in the concrete curing period after a period of time or about a week after the concrete pouring. Water evaporation in the cement slurry will produce shrinkage, and this contraction is irreversible. The shrinkage cracks are mainly caused by the different degrees of water evaporation inside and outside the concrete, resulting in different deformations. The concrete is affected by external conditions, the surface moisture loss is too fast, the deformation is large, the variation of the internal humidity is small and the deformation is small Surface shrinkage deformation by the internal constraints of concrete, resulting in greater tensile stress generated