Study on High Strength Concrete Modified by Recycled Rubber Powder and Steel Fiber

This paper describes a project focusing on improving the mechanical performance of high strength concrete modified by recycled rubber powder. The concrete modified by rubber powder and partial steel fiber or layered steel fiber was used at 1.0%, 1.2% and 1.5% fraction of steel fiber by volume and 3% weight fraction of solid rubber particles. Effect of steel fiber dosage on compressive strength, splitting tensile strength and flexural strength of concrete has been investigated. The addition of steel fiber partially was found to enhance the splitting tensile strength and flexural strength of concrete modified by rubber powder. Fraction of steel fiber up to 1.5% by volume is recommended. The flexural specimen with partially mixed or layered steel fiber of 1.5% by volume is suggested to be used. The test results also show that the additions of steel fiber and recycled rubber powder have improved the resistance to brittle failure of high strength concrete.