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What are the materials and skills for backfilling toilets?
slag
Slag is the best in this area, with good water content and certain structure, but now environmental protection is advocated, and there are basically no slag boilers in urban areas, so it is difficult to find materials. Disadvantages: The slag contains sulfur oxides, which will form sulfuric acid with water in the later stage, which has a certain corrosive effect on iron. It's best not to backfill the bathroom with slag for sewer pipes and ironware.
Brick slag or construction waste
Brick slag is a relatively good backfill material that can be found at present. The disadvantage is water chestnut, which has a certain destructive effect on the waterproof layer. Break it when using it to minimize the destructive power per unit area. A lot of construction waste is mixed with a lot of garbage, such as plastic bags, betel nuts, cigarette butts and so on. Although you can't see inside, it's disgusting to think about it. The only advantage is to save money.
perlite
The texture is too loose and easy to sink, so it is not recommended.
ceramsite
Ceramsite is an artificial lightweight aggregate (lightweight aggregate) with a hard shell, a waterproof and gas-proof glaze layer on the surface and a microporous ceramic body inside. It has good physical, chemical and hydraulic characteristics, large specific surface area, high porosity and strong adsorption and retention capacity. Its surface is porous, angular and rough. It is precisely because of these characteristics that ceramsite is often used to backfill sunken basements.
Waste residue backfill
This method has the advantages of simple construction and low price, but the disadvantage is that some floors are afraid of being overweight, so it is generally not allowed to have better properties, and this method will be gradually eliminated.
Cement precast slab
It's my family's craft. First, cement precast slabs are made outside (reinforcement is needed), and then the precast slabs are put on the caisson, which is a trend of caisson treatment in the future. At present, some cities have requested that caissons be treated in this way.
Lightweight material backfill
It is best to use pearl cotton ceramsite or foam brick, and backfill with sand and cement. This way is the best, but the price is a little higher.
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