In recent years, high-performance concrete and high strength concrete have been developed actively. Minenal admixtures such as blast furnance slag, fly ash and lime powder are indispensable for high-performance concrete and high strength concrete. However, the influence of mineral admixture on the process of chloride ion penetration into hardened concrete is not still fully understood. Therefore, it is necessary to clarify that the influence of admixtures on the process of chloride ion penetration into hardened concrete in case of reinforced concrete structures on the seashore. So, the authors experimented on the influence of mineral admixture on the process of chloride ion penetration into hardened concrete.
