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某工程3780m~2的水泥砂浆地面于1996年3月施工,当年5月发现大面积脱皮、起砂。损失数万元。经检查,该地面的表层有一厚3～5mm的水泥净浆硬壳薄层,该薄层伴有空鼓、开裂现象。揭开硬壳层,便是薄薄的一层粉细砂,手指能抹动其粉末。说明事故原因是地面施工压光前,在其上撤了大量干水泥。 一、干水泥撒面的原因 施工规范要求楼地面水泥砂浆的配合比不宜低于1:2,其稠度不应大于3.5cm。这样施工的水泥砂浆楼地面,无需撒干水泥即可正常抹平、压光,其抗压强度不低于15MPa,不会脱皮、起
The construction of 3,780 m2 cement mortar for a project was carried out in March 1996. In May of that year, large areas of peeling and sanding were found. Loss of tens of thousands of yuan. Upon examination, the surface of the ground had a thin layer of cement paste hard shell with a thickness of 3 to 5 mm. The thin layer was accompanied by hollowing and cracking. Uncovering the hard shell is a thin layer of fine sand that can be wiped by the fingers. It shows that the cause of the accident was the lifting of a large amount of dry cement before it was calendered. First, the reasons for the dry cement surface The construction specification requires that the floor cement mortar mix ratio should not be less than 1:2, its consistency should not exceed 3.5cm. The cement mortar floor under construction in this way can be normally smoothed and calendered without the need to spread the cement. Its compressive strength is not less than 15MPa, and it will not peel off.