Common concrete mixture ratio design involves broad theory and rich practice knowledge.

普通混凝土配合比设计,其涉及的理论和实践知识甚广.

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Semi - flexible pavement is generally described as an open - concrete mixture, which is filled with Portland cement grout.

半柔性路面是一种在大孔隙沥青混合料中填充水泥胶浆而形成的兼具沥青路面与水泥砼路面特点的复合路面.

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