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See Chinese contents: GB/T 17671-2021 GB/T 17671-2021: Test method of cement mortar strength (ISO method)
This document specifies the summary of the method for testing the strength of cement mortar (ISO method), laboratory and equipment, mortar composition, mortar preparation, specimen preparation, specimen maintenance, test procedures, test results, acceptance inspection of Chinese ISO standard sand and substitute equipment. This document is applicable to the flexural and compressive strength testing of general Portland cement and limestone Portland cement mortar. Other cements and materials may refer to this document. This document may not be applicable to strength testing of some types of cement mortar, such as cement with a very short initial setting time.
