Concrete is world’s third most consuming agent at the same time present day construction industry needs an ecofriendly material which should with stand in environment through outs its estimated life span. Concrete is one such material which full fill all the needs of construction industry and lots of research has been going on for predicting its behavior in various environmental conditions. Concrete may be affected by the presence of chloride ion present in the marine environment which affects the passivity of steel film and provokes the initiation of corrosion and lead to deterioration of concrete strength at later ages which in turn decrease its service life etc., To overcome these problems concrete made with different types of admixtures in ordinary Portland cement like Flyash, GGBS, Rice husk ash and Silica fume, or Pozzolana cements, slag cements, pumice stone concrete and low calcium flyash based concrete will serve. The conventional concrete made of ordinary portland cement is not going full fill our needs so in the present study concrete made from portland slag cement of M30 grade is cured in marine water for a period of 178days and it is analyzed for strength, durability properties and a micro level study using SEM/EDX. © 2018, Institute of Advanced Scientific Research, Inc. All rights reserved.