Amir Ghaderi - Civil Engineering University Of Tabriz ,
Maryam Shokri - Architectural Engineering University College Of Nabi Akram
Aida Hashemi - Civil Engineering University Of Tabriz

Resistance to penetration by water is necessary in all concrete structures to prevent loss of structural strength of concrete building materials, particularly due to ASR (alkali silica reaction), acid rain, sulphate attacked. It also prevents chloride penetration which can result in corrosion of the reinforced steel bars and is essential in such structures as tanks, reservoirs, vaults, subways, Floors, Conduits, Walls, basements and roofs. Concrete, as it is ordinarily made, is pervious to water, hence to secure concrete structures through which water will not penetrate some method of waterproofing the concrete must be employed. Many methods have been proposed and are being used; none of these methods is without faults, the best one of them has not yet been determined, and the evidence available as to their comparative merits is biased and conflicting. For these reasons any discussion of waterproofing for concrete is at the present time bound to be unsatisfactory. In this paper, the working methods and new techniques in waterproofing concrete is discussed.

Penetration , Concrete , Strength , Corrosion ,Waterproofing