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1 配合比设计前的准备工作要充分1.1 掌握设计图纸对防水混凝土强度和耐久性要求及结构截面的大小、钢筋布置的疏密,以便考虑选用水泥的品种、骨料的粒径(粗骨料最大粒径不大于40mm)等。1.2 了解施工工艺及是否有特殊性要求,如对混凝土工作性和凝结时间的要求,决定所用细料和外加剂。1.3 了解所能采购到的材料品种和供应能力,以及所用原材料质量是否符合国家相应标准。
1 with the ratio before the preparation of the design should be fully 1.1 Mastering the design drawings of waterproof concrete strength and durability requirements and the size of the structure of cross-section, steel layout density to consider the selection of cement varieties, aggregate size (coarse aggregate Maximum size not more than 40mm) and so on. 1.2 understand the construction process and whether there are special requirements, such as the work of the concrete and setting time requirements, decide on the use of fines and admixtures. 1.3 Know what kinds of materials can be purchased and supply capacity, and the quality of raw materials used meet the corresponding national standards.