Durability Study on the Use of Copper Slag and Washed Silt as Partial Replacement Materials for Fine Aggregate in High Strength Hybrid Fibre Reinforced Concrete

This paper reports the durability study on high strength hybrid fibre reinforced concrete with the use of Copper Slag (CS) and Washed Silt (WS) as partial replacement materials for fine aggregate. Industrial wastes like CS and WS are partially replaced in the range of 5, 10 and 15% to fine aggregate in concrete. The following properties like compressive strength test, water absorption test, percentage of chloride content test and determination of pH will be carried out in the cast specimen. To study the durability characteristics for the above, after 28 days of normal curing, the cast specimens were immersed in 5% Nacl solution for another 30 days. In high strength concrete matrix to avoid catastrophic failure polypropylene fibre and steel fibre were added to the concrete. Polypropylene fibre in the range of 0.2 and 0.4% by weight of cement and steel fibre in the range of 0.25, 0.50, 0.75 and 1% by volume of concrete were added to the concrete individually and in combination. From the test results, it is concluded that the durability characteristic concrete specimen under 5% Nacl solution shows poor performance, when compared with the normal cured specimen.