水泥地面(楼面与地面)同其它事物一样,通过不断地实践、认识、再实践、再认识,人们才逐步的掌握着它的规律性。从六十年代开始,发现流动性砂浆有使地面强度降低,推迟凝结速度,增加收缩裂缝的机会等缺陷,所以发展采用半干硬性或干硬性的水泥砂浆。此外,发现水泥白灰焦渣垫层往往混入未被消化(水解)或慢性的氧化钙,在作好的被压紧的垫层内消化体积膨胀好几倍,以致引起面层的空裂,而现场条件是很难得到完全的氢氧化钙,所以水泥白灰焦渣垫层目前几乎已被淘汰而代之以水泥焦渣。也作过干铺焦渣的尝试,实践的结果,它对面层的破坏更普遍、更严重,所以未被推 The cement floor (floor and ground), like other things, gradually grasps its regularity through continuous practice, knowledge, practice, and recognition. Since the 1960s, it has been found that fluid mortar has the disadvantages of reducing ground strength, delaying the rate of condensation, and increasing the chances of shrinkage cracks. Therefore, semi-rigid or dry-hard cement mortar has been developed. In addition, it was found that the cement white lime coke cushion is often mixed with non-digested (hydrolyzed) or chronic calcium oxide, and the digested volume expands several times in the well-pressed cushion, resulting in surface cracking, and the scene The condition is that it is very difficult to obtain complete calcium hydroxide, so cement coke cushion has almost been eliminated and replaced by cement coke. As a result of the attempt to dry coke residue, the result of the practice was that the damage to the surface layer was more general and serious, so it was not pushed.