Use of Fly Ash for Improvement of Bond Strength with Different Development Lengths and Bars Diameters.

Abstract

Abstract- Concrete is the most significant manmade substance in the world. Unfortunately, concrete has a significant carbon footprint since cement is produced so extensively. A sustainable substitute for cement is the use of fly ash, a byproduct of industrial waste. By evaluating the material's reinforcement bond characteristics, this study seeks to determine whether employing fly ash concrete for structural applications is feasible.
Pull-out tests were conducted on specimens that had cement replaced with 0, 20, 25, and 30% fly ash, and the results were compared to those run on control specimens made of 100% Portland cement. The pull-out tests were performed on specimens using steel bars that were 12 mm, 20 mm, and 25 mm in diameter.
Also, a compressive strength test was performed on specimens with 0, 20, 25, and 30 percent cement replaced with fly ash. As the fly ash percentage increases then the slump value decreases. This creates problems in the workability of the concrete. As the slump decreases, the strength of the concrete increases. As compared to normal concrete specimens' tests performed with 100 percent ordinary Portland cement the use of 25 and 30 percent results in an increase in both compressive and bond strength.