Issue 55

S.S. Ali et alii, Frattura ed Integrità Strutturale, 55 (2021) 187-197; DOI: 10.3221/IGF-ESIS.55.14

Mechanical performance of intelligent asphalt mixture utilizing rejuvenator encapsulated method

Sari Sharif Ali, Mahyar Arabani Dept. of Civil Engineering, University of Guilan, Rasht, Iran sarisharif@yahoo.com, m_arbani@yahoo.com Hassan Latifi Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran Hassan.latifi@srbiau.ac.ir A BSTRACT . In this study, in order to evaluate the effects of heavy vacuum slops (H.V.S) as rejuvenator and nano-Zycosil as an anti-stripping agent on used encapsulation method and mechanical performance of asphalt mixture samples, scanning electron microscopy (SEM), computerized tomography (CT) scan and thermal gravimetric (TG) analyses and also, indirect tensile strength (ITS) and indirect tensile fatigue (ITF) tests were performed. First, an encapsulation procedure to prepare different specimens including modified and unmodified samples with nano-Zycosil was done. In the following, morphology of the nano-Zycosil-modified capsules and aggregates were particularly evaluated. Considering the morphology evaluation and TG analysis diagrams, it was found that most of the capsules resisted the mixing procedure of the asphalt mixture. So, the encapsulation procedure used in this study was a successful technique. In addition, modification with nano-Zycosil as an anti-stripping agent significantly improved the adhesion strength in the matrix of capsules-aggregates-asphalt binder by converting the adhesion type from silanolian to siloxane. Overall, modification of capsules and main aggregates together with nano-Zycosil significantly improved moisture resistance and mechanical performance of asphalt mixture samples.

Citation: Ali, S.S., Arabani, M., Latifi, H., Mechanical performance of intelligent asphalt mixture utilizing rejuvenator encapsulated method, Frattura ed Integrità Strutturale, 55 (2021) 187-197.

Received: 06.10.2020 Accepted: 08.12.2020 Published: 01.01.2021

Copyright: © 2021 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Rejuvenator capsule; Nano-Zycosil; Indirect tensile;

K EYWORDS .

Encapsulation procedure; Moisture resistance.

I NTRODUCTION sphalt mixture is a porous material consists of asphalt binder, aggregates and air voids formed at high temperatures (~180 °C) during mixing process [1]. In long term aging during service life, the stiffness of asphalt mixture increases which results in an increase of asphalt binder’s brittleness due to oxidation and consequently A

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