SALT-SHIELDING CEMENT MORTAR CONCRETE AND ITS HARDENED BODY

摘要

PPROBLEM TO BE SOLVED: To provide salt-shielding cement mortar concrete which has such applicability that it can be used for trowel-finishing, is excellent in chemical resistance, exhibits high salt-shielding property, and has little shrinkage and crack resistance. PSOLUTION: The salt-shielding cement mortar concrete is obtained by kneading a binding material containing 40-65 parts by mass of alumina cement and 35-60 parts by mass of blast furnace slag fine powder, aggregate, and a high-performance water reducer under such a condition that the ratio of water to the binding material is 18-30 mass%. It is preferable that two kinds of a polycarboxylate-based high-performance water reducer and a naphthalene sulfonate-based high-performance water reducer are used as the high-performance water reducer, and the water reducers are added in two stages when they are kneaded. Further, it is preferable that the binding material, the aggregate, the polycarboxylate-based high-performance water reducer, and water are kneaded, and then the naphthalene sulfonate-based high-performance water reducer is added into the resulting mixture and kneaded. A hardened body of the salt-shielding cement mortar concrete is obtained by warm-curing the cement mortar concrete at 35-75C. PCOPYRIGHT: (C)2008,JPO&INPIT