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What symbol is used to indicate the admixture in concrete?

Usually represented by the first letter of the name of the mixture. For example, Anli admixture is represented by A, and Kezhijie admixture is represented by K. Take our company's JHSDO4M-30A as an example. JH is the acronym of our company name. SD stands for side cement, and O4M stands for direct dumping and tower crane. 30 indicates the grade of concrete label. A stands for Amway admixture.