“Technical Specifications for Application of Concrete Admixtures” (GB50119-2013) was promulgated on August 8, 2013 and implemented on March 1, 2014. This specification stipulates that the items for on-site retest of antifreeze are: chloride ion content, density (or fineness), solid content (or moisture content), alkali content and gas content. The water reduction rate of composite antifreeze should also be tested. When testing the chloride ion content of antifreeze containing thiocyanate, formate, etc., ion chromatography should be used. The “Technical Specifications for Application of Concrete Admixtures” (GB50119-2003) stipulates that the items for on-site retest of antifreeze are: density (or fineness), R-7 to R+28 compressive strength ratio and steel bar corrosion test. For the antifreeze entry retest project, the 2013 version of the “Technical Specifications for the Application of Concrete Admixtures” has changed significantly compared with the 2003 version.
The 2013 version of the antifreeze entry retest project added a chloride ion content test and canceled the 2003 version of the steel bar corrosion test, which is more conducive to controlling the corrosion problem of steel bars in concrete. ; Increasing the air content test and canceling the R-7 and R+28 compressive strength ratio test are conducive to the control of the durability of concrete, but not conducive to the control of hardening of concrete mixtures at negative temperatures; increasing the alkali content test is conducive to controlling the alkali bone of concrete material reaction.
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