ASTM Committees C01 on Cement and C09 on Concrete and Aggregates sponsor the Cement and Concrete Reference Laboratory (CCRL). CCRL is located at the National Institute of Standards and Technology (NIST) as a cooperative program between ASTM and NIST. CCRL operates proficiency sample programs in the following construction materials areas: portland cement, blended cement, masonry cement, hydraulic cement concrete, pozzolans, concrete masonry units, and masonry mortar. Contact Robin Haupt on 240-436-4702 for additional information or visit the CCRL web site.