Because of the advantages on strength, environment protecting and constructing convenience, concrete hollow block becomes the best substitute of clay brick.
2
矿渣砖是一种新型的水工建筑材料，它具有强度大、抗冻性强、成本低、利于环保等特点。
Slag brick is a new kind of hydraulic construction material. It has some evident advantages, such as large strength, strong frost-resisting, low cost and beneficial to protect environment.
3
页岩烧结砖没有放射性，具有良好的透水性、保水性，是清洁安全的环保产品。
The tile sintered from shale is a clean and safe environmental product with good water permeability and water locking performance without radioactivity.
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