With asbestos cement mortar pipe being used as inner liner, concrete is cast to form hollow slab.
以石棉水泥砂浆离心管作为内模衬管，浇筑混凝土后构成现浇混凝土空心板。
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Scope of application This technique is applicable to outdoor basic levels such as cement mortar, asbestos cement board, concrete prefabricated board and cast-in-place concrete.