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目前,我国还没有外加剂试验和使用的统一标准,这就给研究、生产和使用带来了困难。这里,仅以外加剂掺量的表示方法为例,谈谈这方面存在的问题。在使用中,外加剂掺量一般以占水泥用量的重量百分比表示,有时也用占拌合水的重量百分比表示(如降低冰点的抗冻剂CaCl_2、NaCl、NaNO_2等)。外加剂与掺合料之间并没有严格的界限,因此,同一种材料(如明矾石膨胀剂)当作外加剂使用时,其掺量用占水泥重量的
At present, China has no uniform standards for the testing and use of additives, which has brought difficulties to research, production, and use. Here, as an example of the expression of additive content, talk about the problems in this area. In use, the amount of admixture is generally expressed as a percentage by weight of cement, and sometimes expressed as a percentage of the weight of the mixed water (such as anti-freezing agents such as CaCl2, NaCl, NaNO2, etc.). There is no strict boundary between admixtures and admixtures. Therefore, when the same material (eg, alunite expander) is used as an admixture, the admixture is used as the cement weight.