Review meeting of CCPA standard Concrete Water-retaining Admixtures was held by China Concrete and Cement-based Products Association (CCPA) and China Building Materials Federation(CBMF) on November 25th，2021. 31 representatives from research and architectural design institutes, colleges and universities, industry associations, producers and users attended the meeting, of which 15 were members of review committee.

The main drafter of the standard introduced the standard preparation process, the collection of comments and the test data that support the main technical content in the standard. The review committee reviewed all the documents, examined the standard text word by word and put forward revisions. The review committee made conclusion that technical content of the standard is advanced and applicable and it reaches the domestic advanced level in general. Finally, the standard was approved by unanimous approval.

Based on the domestic investigation and basic verification tests, Concrete Water-retaining Admixtures makes clear the definition of concrete water-retaining admixtures, innovatively uses the anti-segregation index based on the width of bleeding ring to evaluate the performance of concrete water-retaining admixtures. At the same time, it combines with the domestic concrete admixture testing method to standardize the concrete mix proportion design for test, thus improves the applicability of the standard. The implementation of the standard will standardize the production of concrete water-retaining admixture and provide technical basis and standard guarantee for its engineering application.