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See Chinese contents: GB/T 1345-2005 GB/T 1345-2005: The test sieving method for fineness of cement
This Standard specifies the sieving method for fineness of cement by 45 square-aperture standard sieves and 80 square-aperture standard sieves. This Standard applies to Portland cement, ordinary Portland cement, slag Portland cement, pozzolanic Portland cement, fly ash Portland cement, composite Portland cement, and other types of cement and powdery materials designated to use this Standard.
