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what is the efficiency of the coal gangue grinder

Jan 25, 2021 Since the aim of this study is to maximize the application efficiency of coal gangue in structural concrete, 100% replacement ratio was adopted as the maximum in the test. Table 3 lists the concrete mixture proportions. Different coal gangue replacement ratios, namely 0%, 25%, 50% and 100% were used to prepare two grades of concrete.

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