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　　This standard specifies the classification, technical requirements, test methods, inspection regulations, marking, packing, transportation, storage, and warranty period of the concrete mixers for water and hydropower projects(hereinafter referred to as “concrete mixers”).This standard is applicable to the batch type concrete mixers used for the large and medium-scaled hydraulic concrete mixing plants, with nominal capacity from 1000L to 9000L, and to the continuous type concrete mixers with unit throughput capacity less than 600m3/h. This standard may be applied as a reference for the batch type concrete mixers with nominal capacity less than 1000L.