(1) Each particle size composition must not have particles larger than the maximum size of coarse particles;

(2) The content of coarse particles shall not exceed 3%;

(3) fines content: 3 ~ 6um in fine grain size shall not exceed 8%; 4 ~ 8um to 10 ~ 20, shall not exceed 18%; 12 ~ 22um to 35 ~ 54um shall not exceed 28%.

(4) The most fine-grained content: The fine-grained content of various particle sizes must not exceed 2%.

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