Portland Cement
Association - PCA
Premiere website for everything "concrete." Includes
extensive on-line store for technical bulletins and application notes for
all applications of cement.
Builders Websource® is a corporate
member of ASTM International—a non-profit engineering body dedicated in
part to the standardization of building materials specifications,
products, systems, and test methods for improved health, safety, and
reliability of residential and commercial structures.
