MB admixture halts returned mix hydration, speeds stiffening, eases recycling

Sources: Master Builders Solutions, Beachwood, Ohio; CP staff 

Master Builders Solutions has formulated a new powdered polymer admixture to gel returned concrete mixes, rapidly curtail workability and strength development, then ease handling after they are dispensed from a mixer truck. MasterSuna Returned Concrete Treatment (RCT) 323 Admixture provides ready mixed producers a cost-effective tool to manage a pervasive material handling and disposal challenge. 

“With the use of this new admixture technology, producers can easily and sustainably divert a waste material into other beneficial applications,” says Master Builders Vice President of Admixture Systems, U.S. and Canada Dr. Bruce Christensen. “By eliminating the need for onsite crushing of the returned hardened concrete, it also helps to simplify daily operations.”

National Ready Mixed Concrete Association surveys suggest that 3-5 percent of dispatched load volume is returned to plants, fostering operational, financial and environmental challenges for members. “Master Builders Solutions is assisting producers in addressing these challenges with MasterSuna RCT 323 Admixture,” notes Product Manager, Admixture Systems U.S. & Canada Christopher Eagon. “This one-component product is formulated to treat returned fresh concrete for subsequent use, such as backfill or road base material.” 

bucket of admixture

The charter MasterSuna series offering ships in pails of convenient water-soluble bags. In addition to immediate effects on returned concrete, RCT 323 significantly minimizes cement hydration, making unloaded material easy to break up into a granulated, aggregate-like form. With additional testing and agency qualification, MasterSuna RCT 323-treated material can potentially be used as a partial replacement for coarse aggregates in concrete. Master Builders Solutions plans to announce additional returned concrete mix agents later this year. — www.master-builders-solutions.com/EN-US

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