Performance evaluation of binders and Stone Matrix Asphalt (SMA) mixtures modified by Ground Tire Rubber (GTR), waste Polyethylene Terephthalate (PET) and Anti Stripping Agents (ASAs)

Abstract

The current study assessed the influence of Anti Stripping Agents (ASA), Ground Tire Rubber (GTR), and waste polyethylene terephthalate (PET) on performance behavior of binder and Stone Matrix Asphalt (SMA) mixtures. Through this paper, the 85/100 penetration grade binder was utilized as an original binder. Also, three liquid ASA’s (ASA (A), ASA (B), ASA (C)) were used as a mixture modifier. For this purpose, softening point, penetration, rotational viscosity, Dynamic Shear Rheometer, Multi Stress Creep Recovery (MSCR), and Linear Amplitude Sweep (LAS) tests were implemented to investigate the rheological properties of the modified binder. For evaluating the behavior of modified mixtures, several tests such as; Resilient Modulus, Tensile Strength, dynamic creep, wheel track, and four-point beam fatigue tests were implemented. Based on MSCR test results, utilization of mentioned polymers enhanced the elasticity of binders, and therefore, the permanent deformation resistance of binders increases. Also, by the addition of PET percentage, the rutting resistance improves. Results indicated that utilization of ASAs, PET, and Crumb Rubber (CR) enhance the Resilient Modulus (Mr), Indirect Tensile Strength (ITS), rutting resistance, fatigue life, and Fracture Energy (FE) of asphalt mixtures. Also, based on results, modification of binder by PET/CR with a ratio of 50%/50% and ASA (B) have the highest fatigue life, which indicates that this mixture has highest resistance against fatigue cracking.