Abstract
Conversion of Crumb Rubber Tires (CRT) and waste plastics to functional materials has been shown in this research study as a feasible approach for the improvement of some physical properties of asphalt. The rheological study of the modified asphalt is made through softening point temperature, penetration point, and viscosity tests. In the present study, CRT and Low Density Polyethylene (LDPE) (plastic wastes) were chosen to be the materials of choice to blend with the virgin asphalt. The reclaimed rubber in the form of powder having a particle size below 0.8 mm was used as an additive to liquid asphalt using the Hot Mix Asphalt Process (HMA) at 180.0 ± 2.0°C with a high-speed stirrer rotating at a speed of 3000 rpm for 60 min. For a consistent mix, the blending operations were performed with different CR and LDPE contents; they were 3.0%, 5.0%, 10.0% and 15.0% by weight. LDPE-CR composite was also added to the virgin asphalt at 1:1, 1:1.5, 1:2, and 1:3 ratios. The results of this research study have indicated that these modified asphalt patterns are characterized by having softening point temperatures and penetration points leading to suitable Penetration Indexes (PI) in comparison with virgin asphalt binder. The viscosity of virgin asphalt was also enhanced with the addition of additives. Best results were obtained when CR, LDPE, and CR-LDPE composite concentrations were attained below 10.0% with most at 5.0%. Determining the number and identities of components in the modified asphalt mixture by Thin Layer Chromatography (TLC) and phase distributions of micrographs from Scanning Electron Microscopy (SEM) was also studied.
Highlights
The global problem with land disposal of automobile tires and plastic substances can only be solved by the feasible option left, and that is recycling and utilization of the recycled products
When such modified asphalt binder is blended with gravel, it produces a very durable surface with more sustainability, less affect by temperature variations, lessening the vibrations and impacts as roads subjected to heavy traffic in terms of volume and loading [27]
Photo 4: (a) preparation of a ring filled with the sample; (b) the procedure of the ring and bell test for measuring STP; (c) a canister filled with the sample for measuring the Penetration Point (PP); (d) Penetrometer device used for measuring the samples; (e) a viscometer device
Summary
The global problem with land disposal of automobile tires and plastic substances can only be solved by the feasible option left, and that is recycling and utilization of the recycled products. It is thought that the application of recycled automobile tires and plastics will solve the environmental of these industrial solid wastes problem, and act as very promtising modifiers for the improvement of some materialsengineering characteristics such as asphalt pavement material [1,2]. The most common and globally used polymers include approximately 75% elastomeric modified binder, 15% plastomeric and the remaining 10% belongs to either rubber or other modifiers [16] In this case, Plastic wastes present in many types of solid materials (i.e. water bottles, carry bags, wrappers of biscuits and detergents, etc.) combine the advantage of reducing cost as well as management problem for asphalt industries and producing better asphalt pavement [17,18]. Toluene as a solvent was purchases from Puch Company in Poland
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