Influence of Aluminium Dross on the Marshall Properties of Asphalt Mixture
1,2,*Adeboje, A.O. 2Afinni, O.A., 2Adeniyi, S. J., 1Adelowo, T.C. 3Ademokoya, S.O., and 1Adeniran, A.E..
1,2, Department of Civil Engineering, Babcock University, Ilishan Remo, Ogun State, Nigeria.
2,Department of Civil and Environmental Engineering, University of Lagos, Lagos, Nigeria
3Department of Mechanical Engineering, Babcock University, Ilishan Remo, Ogun State, Nigeria.
DOI: 10.36108/laujoces/5202.41.0180
Abstract
Aluminium dross (AD), a toxic industrial waste, is generated in huge amount from the smelting of aluminium. Its disposal into the environment poses significant challenge on the industry operators and causes danger to humans, animals and plants. AD is evaluated as a substitution of filler for the enhancement of the Marshall properties of asphalt mixture. AD sample was sourced from a steel manufacturing industry, its grain size and that of aggregates were determined. The addition of AD significantly affected various properties of the asphalt mixture. Tests revealed binder characteristics (specific gravity (SG), softening point (SP), viscosity, and ductility) and changes on the performance of asphalt mixture (Marshall stability, flow, Marshall quotient, unit weight, maximum specific gravity, air voids, voids in mineral aggregate, and voids filled with bitumen). Asphalt modification with full replacement of filler with AD at bitumen contents of 4.5, 5.0, 5.5 and 6% gave Marshall stability between 5.7 and 7.2kN, flow between 3 and 3.3 mm, unit weight between 2.25 and 2.28g/l, maximum specific gravity from 2.33 to 2.39, Marshall quotient from 1.73 to 2.32kN/mm; air voids between 2.1 and 5.8 %, VMA and VFB from 17.3 to 17.6% and 66 to 88%, respectively, and aggregate contents from 94 to 95.5. Replacement of filler with AD at 5% optimum bitumen content improved the stability of asphalt and correspondingly reduce the Air voids, maintaining a stable and durable road pavement. Therefore, full substitution of filler with AD at 5% bitumen content enhanced sturdy and environment friendly asphalt production.
Keywords: Aggregates, aluminium dross, HMA, industrial waste, Marhsall quotient, softening point, specific gravity..