EFFECT OF SEA WATER ON THE COMPRESSION STRENGTH OF CONCRETE

Abstract

Now-a-days, construction of concrete in coastal areas has long been facing the challenge of keeping the concrete as durable concrete structures in a saltwater environment. The main aim of this research is to find the effect of seawater curing of strength and  durability of different  concrete structures. Chloride concentration is initially higher in seawater. To design a concrete, which can withstand the attack of sea water, a coal combustion byproduct bottom ash, a fly-ash was used in this study to determine the strength and durability of the concrete against seawater effect. The chemical reaction of chlorides, sulphates and alaklies like sodium and potassium and in some cases dissolved carbon dioxide will affect the strength of concrete as well as durability vigorously. As a part of durability study, this paper describes the effect of sea water on compressive strength of concrete when used as mixing and concrete specimens were cast from four different mixes and plain water as well as sea water was used as mixing water in making the test specimens. This green concrete containing bottom ash for fine aggregate replacements (30%)  and again 30% bottom ash and 30% fly-ash is used in another mix, 30% fly-ash alone is used in another mix for fine aggregate replacements. These concrete specimens are cured in normal tap water as well as seawater. The specimens were tested cured and tested for compressive strength. Test results indicate that the loss of concrete strength in normal water curing and the seawater curing.