Partners AMERICAN CONCRETE INSTITUTE (ACI) www.concrete.org AMERICAN SOCIETY FOR TESTING & MATERIALS (ASTM) www.astm.org BASF ADMIXTURES www.basf-admixtures.com MASSACHUSETTS CONCRETE &AGGREGATE PRODUCERS ASSOCIATION(MACAPA) www.macapa.org NATIONAL READY MIXCONCRETE ASSOCIATION (NRMCA) www.nrmca.org PORTLAND CEMENT ASSOCIATION (PCA) www.cement.org