Effect of aggregate type on Marshall properties of bituminous mix containing fly ash as filler

Abstract

Reusing of rapidly growing wastes is an important environmental concern and usage of agricultural and industrial wastes in road construction is a practice of years. Accordingly in this paper study the effect of using FA as alternative filler in place of conventional HL on Marshall Properties of bituminous mix having both calcareous LSA and siliceous BSA. For this purpose, samples were prepared using four different bitumen content between 4.5% and 6.0% by total weight of aggregate at 0.5% increments and with 2%, 4% and 6% filler content for both the said aggregates. The control mix was prepared using BSA with HL filler. The optimum bitumen content (OBC) was then determined for all the mix by Marshall Mix design. The study result showed that the mixes having FA as filler with both BSA and LSA give less OBC values compare to control mix. The mix having LSA give better MS values than BSA and also the mix contain FA give better MS value as compare to control mix except for 2% FA as filler in case of LSA aggregate. MQ results indicated that the FA filler mainly in higher percentage (4% and 6%) provide stiffer mix than HL for both the aggregates. So this study discusses the feasibility of using FA as alternative filler instead of HL in asphalt concrete mix in the areas where LSA and FA are generally available.