水泥砂浆的门窗护角、窗台抹灰、踢脚板或墙裙上口,常常起鼓、脱落。有的地面、散水、屋面、路面等处的水泥砂浆抹灰,也常发生起鼓现象。除其它原因外,采用白灰、麻刀白灰、白灰砂浆去作水泥砂浆的垫层,也是不容忽视的重要原因。为什么白灰、白灰砂浆与水泥砂浆不能长期牢固地粘接在一起呢?因为这两种不同性质的材料在强度上有悬殊的差别,一 Door and window corners of cement mortar, windowsill plastering, kickboards or wall skirts are often used for drumming and shedding. Some cement mortar plasters on the ground, loose water, roofs, roads, etc., also often cause druming. Among other reasons, the use of white ash, hemp white ash, and white-gray mortar as cushions for cement mortar is also an important reason that should not be overlooked. Why is it that white lime, white-ash mortar and cement mortar cannot be firmly bonded together for a long time? Because of the great difference in strength between these two different materials, one