Concrete Contractors chime in on portland-limestone cement mixes

Sources: American Society of Concrete Contractors, St. Louis; CP staff

The American Society of Concrete Contractors has kicked off a members-only “ALERT!” bulletin series with a look at portland-limestone cement concrete mixes. The two-page document reminds Society members how any new mix ingredient can trigger changes in concrete performance; lists variations contractors have reported with PLC mix loads; offers finishing and handling recommendations; and, proposes discussions with ready mixed producers on expectations and concerns. 

“ALERT! bulletins will be published as needed to provide timely notice of unusual, challenging, and sometimes complex circumstances affecting the industry,” says ASCC Sustainability Committee Co-Chair Bruce Suprenant, PhD, PE, FACI.

“Increasingly our contractors have been calling ASCC’s Concrete Construction Hotline about issues with portland-limestone cement concretes,” adds Concrete Construction Specialist Jim Klinger, who mans the hotline.  

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