Partial Replacing Of OrdinaryPortland Cement With Corncob Ash In Concrete

Abstract

The purpose of this study isto investigate thefeasibility of using corn cob ash in concrete mixes. concrete is the most important engineering material and the addition or replacement of some materials may change the properties of the concrete .In recent years a lot of of research work has been carried out in order to obtain more durable and long performance of concrete structures in the dynamic environment an experimental program is set up to test the effect of corncob ash with variation of percentages in concrete mixes. Different Corncob Ash percentage were tested in this study (0%, 5%,7.5%, 10% )respectively. The laboratory investigation include measurement of compressive strengths and workability .the mix was designed by British Standard method ,characteristic compressive strengths [25N/mm2]. An experimental study was carried out to test forth types of concrete mixes designed and compressive strength of concrete was measured in the re construction of curing for 7,28 and 56 days. one of those mentioned mixes is a ( control mix) .finally all the result are compared. The study shown the effect of corncob ash on workability of fresh concrete by increasing with the proportioncorncob ash( slump equal 44,50 and 56 mm in proportion 5%,7.5%, and 10% Respectively).and of hardened concrete the compressive strength increasing with increasing the age of curing and decreasing with increase theproportioncorncob ash .