Answer:
(1) each particle size composition shall not have particles larger than the maximum size of coarse particles;

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

(3) fines content: the fines of 3-6um shall not exceed 8%; the fines of 4-8um to 10-20 shall not exceed 18%; the fines of 12-22um to 35-54um shall not exceed 28%.

(4) fines content: the fines content of various sizes shall not exceed 2%.