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在房屋的维修工作中,经常碰到地(楼)面工程中的水泥砂浆面层起砂、脱皮、开裂的现象。笔者在日常维修施工中进行观察,并根据对地(楼)面损坏房屋的调查,归纳水泥砂浆面层损坏的主要原因如下:一、起砂的原因(一)在材料上要求不严:地坪水泥标号一般要求在400号以上,28天的抗压强度应在200号以上。但有些施工人员认为地坪无关大局,常以过期水泥或低标号水泥代用,造成强度降低。再者,砂
In the maintenance work of the house, the cement mortar surface layer in the ground (floor) surface project often encounters sanding, peeling, and cracking. The author observed in the daily maintenance and construction, and based on the investigation of the damage to the floor (building) surface, summed up the main reasons for the damage of the cement mortar surface are as follows: First, the reasons for sanding (A) in the material requirements are not strict: Flat cement markings are generally required to be above 400, and the 28-day compressive strength should be above 200. However, some construction workers think that the floor is not related to the overall situation, and often use outdated cement or low-grade cement instead, resulting in reduced strength. In addition, sand