Fast freezing-thawing test Chamber to determine the concrete specimen under thawing conditions of frozen water in the water, undergo rapid freezing and thawing cycles of concrete frost resistance. Product standard: the standard for test methods of long-term performance and durability of ordinary concrete GB/T50082-2009; JTJ270-98 of the test procedures for concrete in water transport engineering; the test specification for hydraulic concrete DL/T5150-2001; of the cement and cement concrete in highway engineering test procedures for JTG E30-2005