Hard-Cem, integral hardening admixture, extends concrete wear life up to 2 times under harsh conditions. It is added to the concrete at the time of batching to increase the hardness of the concrete and expand concrete wear life. It outperforms and overcomes deficiencies of labor intensive surface applied hardeners, and can be used to enhance durability of both air-entrained and non-air-entrained concretes. Since it is integral, Hard-Cem can be used to harden horizontal, vertical or inclined concrete and shotcrete surfaces.