Influence of Fly Ash as Mineral Filler in Bituminous Mix Design

Volume 3 - Issue 2

Akhtar Hossain*, Tasaddik Khan, Jonayed Ahmed and Ashikuzzaman

Received: September 19, 2018;   Published: September 25, 2018

DOI: 10.32474/TCEIA.2018.03.000156

Full Text PDF

To view the Full Article   Peer-reviewed Article PDF

Abstract

This study is about the effect of fly ash as filler on bituminous mix design under various condition. The main purposes of this project is to study the possibility of using fly ash as mineral filler in bituminous paving mixes where in general stone dust are used. Fly ash from Barapukuria Coal Power Plant has been used in the present experimental work. Suitable aggregate grading is selected for bituminous mixes. Standard Marshall Mix design procedure is followed in the design by using standard filler stone dust and testing of those mixes to determine the density, stability, flow, voids in mixes and optimum bitumen content. By this optimum bitumen content, mixes are prepared by replacing standard filler stone dust with fly ash at levels 25%, 50%, 75% and 100% by weight of total filler. The mixes are tested to obtain optimum fly ash content. By fixing optimum bitumen content and fly ash content mixes are prepared to observe the effect of water submergence on compacted mixes where compacted mixes are submerged in water for 5, 10, 15 and 20 days. In this study, it is found that 25% fly ash and 75% stone dust by total weight of filler satisfy the mix design criteria for medium traffic condition. So 25% fly ash by total weight of filler can be used as optimum. Again, compacted mixes, prepared using optimum fly ash content and optimum bitumen content, can be submerged in water for 10 days at room temperature. So compacted mixes, prepared using 25% fly ash by total weight of filler and 5.56% OBC, are suitable for flood plain areas where roads are submerged in water for 10 days.

Keywords: Optimum Bitumen Content; Optimum Fly Ash content; Stone Dust; Water Effect

Abbreviations: AASHTO: American Association of State Highway and Transportation Officials; BS: British Standard; CA: Coarse Aggregate; FA: Fine Aggregate; MF: Mineral Filler; OBC: Optimum Bitumen Content; Va: Voids in total Mix; VMA: Voids in Mineral Aggregate; VFB: Voids Filled with Bitumen

Abstract| Introduction| Materials & Methodology| Result and Discussion| Conclusion| References|