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See Chinese contents: GB/T 14902-2012 GB/T 14902-2012: Ready-mixed concrete
This Standard specifies the terms and definitions, classification, performance grades and markings, raw materials and mixing ratios, quality requirements, preparation, test methods, inspection rules, ordering and delivery of ready-mixed concrete. This Standard is applicable to ready-mixed concrete produced in mixing plants (towers). This Standard does not include the pouring, vibrating and curing of concrete after delivery.
