EFFECT OF SALT WATER ON CONCRETE USING BIDA NATURAL STONES AS COARSE AGGREGATE

EFFECT OF SALT WATER ON CONCRETE USING BIDA NATURAL STONES AS COARSE AGGREGATE

ABSTRACT

Concrete is a combination of cement, fine and coarse aggregates and water, which are mixed in a particular proportion to arrive at a particular strength. The cement and water react together chemically to form a paste together with the aggregate particles. The mixture sets into a rock-like solid mass, which has considerable compressive strength but little resistance in tension. In this research, concrete was properly mixed using salt water at 35g/l and water only respectively with Bida natural stones as coarse aggregate in the production of concrete. The physical and mechanical properties of the aggregates were determined and the compressive strength of hardened concrete were determined at 7, 14, 21 and 28 days curing. A total of 144 cubes were cast and cured for 7, 14, 21 and 28 days. The mix ratio of 1: 2: 4 and w/c 0f 0.5 were used. The concrete developed in this work has slump ranging from 0 – 135 mm, compressive strength ranging from 8.94 N/mm² - 27.11 N/mm² and density ranging from 1757.04kg/m3 to 2198.52kg/m3 respectively. The use of salt water should be welcome and not feared for casting and curing of concrete during construction most especially in coastal environment if a mix ratio of 1:1.5:3 grade M20 is applied.

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