The effect of Environmental Conditions on the Penetration and durability of Cl Ion in Ordinary and Self-consolidating Concrete Containing Nano-silica

Corrosion and other destructive factors in corrosive areas have caused irreparable damages to Iranian economy as well as to the concrete structures in such areas. Therefore, it is necessary to investigate and identify the behavior of concrete in these areas in order to prevent early destruction. Obviously, the most important factor in destruction and reduction of useful life of concrete structures is the penetration of Cl ion and the related corrosions. One of the methods to make the concrete impenetrable is to use different pozzolans for improving its structure. In this investigation, the performance of Nano-silica pozzolan (2, 3, 5, 7 & 10 %) is studied for the purpose of increasing resistance against Cl ion penetration in simulated conditions of Oman sea environment (tidal and immersion) in ordinary and Self-consolidating concrete. The results show positive performance of the instances containing Nano-silica in contrast with the concrete without it. Meanwhile, comparing ordinary and Self-consolidating concrete, we found out higher persistence of Self-consolidating concrete against Cl ion and destructive conditions of tidal environment than those of ordinary concrete.