During the recent past ,the problem of early deterioration of concrete structures and durability of concrete structures has remained major issue posed to engineers . we have reported here the incorporation of Metakaolin ,fly ash ,GGBS and silica fume in binary and ternary blended system with diverse Water binder ratio. Various .concrete mixes with supplementary Cementitious material has been prepared and Steel Fiber & plasticizer dosage has been varied. Different types of tests carried out for determining the various durability properties such as such as RCPT, Chloride diffusion and corrosion initiation time An attempt has been made in this study to develop a tool for service life estimation of concrete structure. mathematical model for service life prediction presented here also suitable for existing concrete structures exposed to natural environment.