Abstract
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.
Highlights
Asphalt mixture is a porous material consists of asphalt binder, aggregates and air voids formed at high temperatures (~180 °C) during mixing process [1]
In order to evaluate the effects of used rejuvenator encapsulated method and nano-Zycosil as an anti-stripping agent on mechanical performance of asphalt mixture samples, scanning electron microscopy (SEM), computerized tomography (CT) scan and thermal gravimetric (TG) analyses and indirect tensile strength (ITS) and indirect tensile fatigue (ITF) tests were performed
The results showed that the modification of aggregates with nano- Zycosil in the samples including unmodified capsules significantly increased tensile strength and fatigue resistance compare to samples without modified aggregates
Summary
Asphalt mixture is a porous material consists of asphalt binder, aggregates and air voids formed at high temperatures (~180 °C) during mixing process [1]. Reduction in surface friction of the pavement and the environmental contaminations were the other concers On these matters, some researches let to encapsulate rejuvenators in order to use in asphalt mixtures [11]. One of the advantages of these capsules is their high resistance at high temperatures during mixing process They could remain unbroken until the rejuvenators are necessary in resoring asphalt binder properties. In order to evaluate the effects of used rejuvenator encapsulated method and nano-Zycosil as an anti-stripping agent on mechanical performance of asphalt mixture samples, scanning electron microscopy (SEM), computerized tomography (CT) scan and thermal gravimetric (TG) analyses and indirect tensile strength (ITS) and indirect tensile fatigue (ITF) tests were performed.
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