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目前,国内制造钢筋混凝土管大都采用离心成型工艺。由于离心法制管,混凝土混合物的分布和密实,主要是依靠离心力的作用,故须采用具有一定流动性的塑性混凝土。这种混凝土混合物在离心力的作用下,发生掺合料离析现象,形成分层结构,管壁内外层极不均匀,外层混凝土中砂浆较少,抗渗能力差,强度也低,管壁内表面形成一层较厚的胶砂层,这层胶砂层中含有大量的水泥,水分较多,硬化后干
At present, most of the domestic manufacturing of reinforced concrete pipes adopt centrifugal molding technology. Due to the centrifugation method, the distribution and compaction of the concrete mixture mainly depend on the centrifugal force, so the plastic concrete with certain fluidity must be used. This kind of concrete mixture under the action of centrifugal force, the phenomenon of admixture material segregation, the formation of a layered structure, the wall inside and outside the layer is very uneven, less mortar in the outer layer of concrete, impermeability is poor, the strength is also low, within the wall The surface forms a thick layer of glue sand, which contains a lot of cement, more water, and is hardened.