The test methods for the chloride ion content, density (or fineness), solid content (or moisture content) and alkali content of the antifreeze retest items are based on the “Concrete Admixture Uniformity” Qualitative Test Methods” (GB8077-2012) was carried out, and the air content and water reduction rate test methods were carried out according to “Concrete Admixtures” (GB8076). Generally, ready-mix concrete companies have test conditions for density (or fineness), solid content (or moisture content), air content and water reduction rate tests; for chloride ion content and alkali content tests, some ready-mix concrete companies do not meet the test conditions. , mainly restricted by factors such as equipment or test personnel, and need to be entrusted with third-party testing.
“Concrete exterior “Test Methods for Homogeneity of Concrete Admixtures” (GB8077-2012) was released on December 31, 2012 and implemented on August 1, 2013. Compared with “Test Methods for Homogeneity of Concrete Admixtures” (GB8077-2000), it has added high Performance water-reducing agent, the expansion agent has been deleted; the test method for the determination of chloride ions by ion chromatography has been added; the test method for the water reduction rate of cement mortar has been added, and the workability test method of cement mortar has been deleted; the solid content determination method and the water content have been added The rate determination method was deleted, and the solid content determination method was deleted; a total alkali content blank test was added and other changes were made. The added moisture content determination method makes up for the lack of moisture content determination methods for some admixtures.
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