Effect of using fly ash as alternative filler in hot mix asphalt

In this study, the effect of using fly ash (FA) in asphalt mixture as replacement of common filler was investigated. For these purpose, samples were prepared for different bitumen content (3.5% to 6.5% at 0.5% increments) by using 2% hydrated lime (HL) in control mix as well as varying percentage of FA ranging from 2% to 8% as alternative filler in modified mixes. The optimum bitumen content (OBC) was then determined for all the mix by Marshall mix design. Experimental results indicated higher stability value with lower OBC for the mixture having 4% FA as optimum filler content in comparison with conventional mix and standard specification. So especially in areas where fly ash is generally dumped, can be used instead of HL in asphalt concrete mix as mineral filler.

Source: Perspectives in Science - April 27, 2016 Category: Science Source Type: research