我国生产的水泥品种、标号、生产厂家频多,其熟料的煅烧方式不一,工艺各异。水泥生产的掺合料如矿渣、铁渣、火山灰、粉煤灰、窑灰、石粉等品种和掺量也很多,因而同一品种标号的水泥早期和后期强度差别较大,特别是水泥标养28天的强度。各生产厂家采取的控制标准差别较大,施工生产使用时,同品种、同标号水泥标养28天强度标准差在3.5～5MPa之间,给混凝土强度波 China produces more varieties, labels, and manufacturers of cement, and its clinker is calcined in different ways and processes vary. There are also many types and amounts of admixtures used in cement production such as slag, iron slag, volcanic ash, fly ash, kiln dust, and stone dust. Therefore, the early and late strengths of cements of the same type are markedly different, especially for cement standards. The intensity of the day. The control standards adopted by each manufacturer are quite different. When the construction is used in production, the standard deviation of strength for the same type and the same grade of cement for 28 days is between 3.5 and 5 MPa, giving concrete strength waves.