以炉渣灰作为平房灰打顶的骨料,在我国大部分地区已经沿用日久;但对于远离厂矿的农村或山区,由于运输不便,炉渣灰倒成了一种价格昂贵的短缺材料。这里介绍一种以粘土砖头作为灰打顶骨料的碎砖轻质混凝土屋面。炉渣灰的容重为1000公斤/米~3,碎砖的容重为1200公斤/米~3。设想一幢面积为70平方米的屋面需要5立方米的轻质骨料,用碎砖作骨料比用炉渣灰自重增加1000公斤,平 Slag ash is used as the aggregate for cottage ash topping. It has been used in most parts of China for a long time. However, for rural or mountainous areas far from factories and mines, due to inconvenient transportation, slag ash has become an expensive material. Here is a broken brick lightweight concrete roof with a clay brick as a ash capping aggregate. The slag ash has a bulk density of 1000 kg/m3 and the crushed bricks have a bulk density of 1200 kg/m3. Imagine that a building with an area of ​​70 square meters requires 5 cubic meters of lightweight aggregate, and the use of crushed bricks as the aggregate increases the weight by 1000 kg compared to the use of slag ash.