1 Concrete admixtures; chemicals for manufacture of concrete; chemical additives and admixtures for cement, concrete, mortar or masonry; concrete additives; concrete and masonry additives and admixtures being chemical preparations for use in industry; chemical compounds for curing concrete; chemical additives for use as binding agents in concrete; chemical agents, additives, and admixtures for modifying one or more properties of cement, mortar, masonry, concrete, or other cementitious materials