Holcim (US) Inc. is headquartered in Waltham, MA. Holcim is one of the largest manufacturers and suppliers of cement and mineral components in the United States. In addition to Portland cements, Holcim produces fly ash and slag cement products, such as GranCem(R) cement, to enhance concrete performance. Holcim also makes blended and masonry cements in a wide variety of colors.

SPEC MIX(R) is your national source for high quality, factory produced cementitious products for the construction industry. With 57 licensed manufacturers located in major markets across the U.S., and Canada, the SPEC MIX team utilizes computerized batching equipment and the finest materials to ensure total quality control throughout your project. We also offer various patented silo systems to maximize a contractor's proficiency and safety rating. Our purpose is to keep your crew going, moving and working.