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我国水泥产品,从五十年代中期以来,一贯沿用着“多品种、多标号”的结构形式。其间,水泥质量标准虽有几次修订,但通过混合材料的掺加,形成不同品种和标号的形式未变。三十年来,因混合材料的充分利用,对增产水泥确实是卓有成效的。然而,若从水泥使用角度分析.却存在着很大问题。由于用户没有条件按不同工程的要求,合理选用水泥的品种和标号,而水泥生产厂又受着产量计划的沉重压力,无法满足用户在品种和标号上的要求,所以经常出现中标号水泥配制高标号混凝土,或高标号水泥配制中、低标号混凝土,或要求早强的构件因
China’s cement products have consistently followed the “multiple varieties and multiple labels” structure since the mid-1950s. In the meantime, although cement quality standards have been revised several times, the formation of different varieties and labels has not changed through the blending of mixed materials. In the past 30 years, due to the full use of mixed materials, cement production has indeed been effective. However, if we analyze from the perspective of cement use, there are big problems. Because the user did not have the condition to select the type and label of cement rationally according to the requirements of different projects, and the cement production plant was under heavy pressure from the output plan and could not meet the user’s requirements in terms of variety and labeling, so there was often a high grade of cement preparation. Marked concrete, or high-grade cement, medium and low-grade concrete, or components requiring early strength