Abstract
This study reports the findings of an experimental investigation conducted to study the effect of two types of coarse aggregates on the performance of concrete in terms of compressive strength, modulus of elasticity, and steel-corrosion penetration rate. For this purpose, 27 concrete mixtures were prepared from each type of coarse aggregates by varying key mixture parameters, namely water/cementitious materials ratio, fine/total aggregate ratio, and cementitious materials content. In all the mixtures, 8 % cement was replaced with silica fume. Compressive strength and modulus of elasticity were determined on cylindrical concrete specimens after 28 days of water curing. Electrochemical tests for determining corrosion penetration rate were conducted on reinforced concrete specimens with 25 mm cover thickness and exposed to 3 % NaCl solution after water curing for 28 days. The test results indicate that the type of coarse aggregate significantly affects the strength, modulus of elasticity, and steel-corrosion resistance of concrete. It was also noted that it is essential to control the quality of mortar while utilizing marginal quality aggregates.
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