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一般建筑工程中,抹灰使用的水泥约占水泥总用量的30%。长期以来由于低标号水泥(225号以下)没有供应渠道,几乎都使用425号乃至525号水泥进行抹灰,使用极不合理。这是因为一般抹灰砂浆其性能主要要求有良好的和易性和保水性,以满足操作要求,使抹灰层符合平整、光洁、不空、不裂等质量标准,而对强度无太高要求(除地面面层外)。对有些基底(如加气混凝土)若抹灰层强度太高,则容易引起空鼓、裂缝、对质量
In general construction, the cement used for plastering accounts for about 30% of the total amount of cement. For a long time, low-grade cement (No. 225) has no supply channels, and cements 425 to 525 are almost all used for plastering, which is extremely unreasonable. This is because the general plastering mortars mainly require good workability and water retention to meet the operational requirements, so that the plastering layer meets the quality standards of smoothness, smoothness, no air, and no cracking, but not too high in strength. Requirements (except ground floor). For some substrates (such as aerated concrete) if the plaster layer is too strong, it is easy to cause hollowing, cracks, and quality