Novel Methodology to Investigate and Obtain a Complete Blend between RAP and Virgin Materials

Abd, Duraid M, Al-Khalid, Hussain and Akhtar, Riaz ORCID: 0000-0002-7963-6874 (2018) Novel Methodology to Investigate and Obtain a Complete Blend between RAP and Virgin Materials. JOURNAL OF MATERIALS IN CIVIL ENGINEERING, 30 (5). 04018060-.

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Abstract

Pavement engineers are continually attempting to resolve the problems associated with the disposal of highway construction materials and conserve the natural resources in line with producing a more economically and environmentally friendly asphalt mixture. This study presents a novel methodology to investigate and obtain a complete blending in the laboratory using a nanomechanical approach so that designers can be more confident in estimating the performance of asphalt mixtures incorporating reclaimed asphalt pavement (RAP) materials. The study also presents an effect of warm additives, Sasobit and Rediset LQ, on the level of blending between RAP and virgin materials. Images obtained from nanoindentation were validated using a scanning electron microscope (SEM), while the level of blending was linked to the overall fatigue cracking of asphalt mixtures, which was measured using dynamic shear rheometer (DSR). It was revealed that although Rediset LQ improved the fatigue life and nanomechanical properties of the virgin interfacial transition zone (ITZ) and mastic phases, it has no effect on the diffusion of virgin binder into aged binder (binder surrounding RAP aggregate) or rejuvenating of aged binder, whereas Sasobit decreased the viscosity of binder and has a great influence in accelerating complete blending between RAP and virgin materials. In summary, nanoindentation integrated with an optical microscopy is a powerful technique to investigate and obtain complete blending between RAP and virgin materials.

Item Type:	Article
Uncontrolled Keywords:	Hot mix asphalt (HMA), Warm mix asphalt (WMA), Nanoindentation, Scanning electron microscope (SEM), Dynamic shear rheometer (DSR), Reclaimed asphalt pavement (RAP), Fatigue
Depositing User:	Symplectic Admin
Date Deposited:	03 May 2018 09:53
Last Modified:	16 Mar 2024 21:42
DOI:	10.1061/(ASCE)MT.1943-5533.0002230
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3020768