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Pavements 2025

Asphalt Binder and Mixture Characterization

POSTER RECEPTION (View list of posters here)

Effects of end-of-life tire based composite additive on the properties of asphalt mastic

Tuesday, June 10, 2025
4:45 PM – 6:00 PM MT
Abstract: The present paper investigates the effects of the composition of SMAPOL, an additive produced from end-of-life tires on the rheological properties of asphalt mastic composed of a paving grade, non-modified asphalt binder and limestone filler. The additive in question is comprised of two components. First was constituted by fine crumb rubber particles produced in an ambient temperature grinding process, followed by partial devulcanization and activation. The second element was comprised of tire cord textile fibers, which in the processing of tires are separated and milled to a small length, less than 10 mm. The experiments were conducted in accordance with a factorial design with the amounts of the two components of the additive being the factors in question. The evaluated characteristics included measurements of dynamic viscosity in wide range of temperatures evaluated using a rotational viscometer and dynamic shear rheometer tests including complex shear modulus and phase angle in oscillatory shear and non-recoverable creep compliance with the evaluation of percent recovery in the multiple stress creep recovery tests with incrementally increasing stress values. The obtained results were referenced with asphalt mastic without the additive, comprised only of the asphalt binder and mineral filler. The obtained results permitted evaluating the effects of the different components of the end-of-life tire-based additive on the performance of the asphalt mastic.

Learning Objectives:

Attendees can expect to learn the following from this session:
  • Upon completion, participant will be able to evaluate properties of the end of life tire based additive
  • Upon completion, participant will be able to evaluate the effects of the end of life tire based additive on the properties of asphalt mastic
  • Upon completion, participant will be able to ascertain feasibility of the end of life tire based additive for asphalt mixtures