EVALUATION OF MARSHAL STABILITY AND FLOW OF HYBRID MODIFIED ASPHALT CONCRETE

• Ezemenike, C. S.

  Federal University of Technology Akure.

• Aderinlewo, O. O.

  Federal University of Technology Akure.

• Oladele, I. O.

  Federal University of Technology Akure.

• Oyedepo, O. J.

  Federal University of Technology Akure.

Highway engineers and researchers are constantly trying to enhance the performance of asphalt concrete
pavement, in order to keep up with the global adequate and sustainable highway infrastructure drive. Modification
of asphalt concrete could improve certain properties of the mixture and reduce cost of road construction materials.
In this research, evaluation of Marshal Stability and flow of hybrid asphalt modified concrete was studied, the
wastes from various industries such steel industry, plastic industry and coal-fired power plant industries were
combined together to form hybrid composite. Steel slag, fly ash, waste plastic, aggregate and bitumen were used to
produce the asphalt concrete in a hybrid manner to evaluate effect of stability and flow properties of asphalt
concrete mixture. The physical properties of steel slag, fly ash aggregate, bitumen and waste plastic based
polypropylene were determined by carrying out tests such as sieve analysis, moisture content, flakiness and
elongation, aggregate impact, aggregate crushing, specific gravity, hygrometer, penetration, softening point, flash
and fire point, viscosity, ductility and water-in-bitumen test. Bitumen with penetration grade 60/70 was used and the
content varied from 5.0 to 7.0 % at 0.5% interval. A cylindrical sample with the composite mixture of asphalt
concrete was produced using varying proportions of hybrid composite which comprises of steel slag (SS) and fly ash
(FA) at 2%, 4%, 6% and 8% by weight of the asphalt concrete to partially replace the conventional materials
(aggregate and filler) and bitumen which was partially replaced with polypropylene (PP) at 5%, 10%, 15% and
20% respectively. The Marshal Stability test conducted on the hybrid composite asphaltic concrete gives optimum
stability values of 10.50 kN, 12.50 kN, 12.30 kN and 13.50 kN and optimum flow values of 3.30 mm, 2.80 mm, 2.80
mm, and 2.70 mm at 2%, 4%, 6% and 8% respectively. Comparing with Asphalt Institute specification, the nonconventional
material used as fillers, coarse and fine aggregate can be conveniently used in light, medium and
heavy traffic. Based on the findings, the application of these wastes material which constitute higher stability and
flow will improve the properties of asphalt concrete, reduce the cost of constituent material and decrease
environmental problem that arise from various industries.

1. Ezemenike, C. S., Federal University of Technology Akure.

   Department of Civil Engineering 

2. Aderinlewo, O. O., Federal University of Technology Akure.

   Department of Civil Engineering 

3. Oladele, I. O., Federal University of Technology Akure.

   Department of Metallurgical Materials Engineering 

4. Oyedepo, O. J., Federal University of Technology Akure.

   Department of Civil Engineering 

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