Effects of different bitumen modifiers on the rutting and cracking resistance of hot mix asphalts

Muhammed Ertuğrul ÇeloğluFaculty of Engineering, Department of Civil Engineering, Fırat University, Elazığ, TurkeyCorrespondence[email protected]

Erkut YalçınFaculty of Engineering, Department of Civil Engineering, Fırat University, Elazığ, Turkey;Nottingham Transportation Engineering Centre, School of Civil Engineering, University of Nottingham, University Park, Nottingham, UK

Baha Vural KökFaculty of Engineering, Department of Civil Engineering, Fırat University, Elazığ, Turkey

Taner AlataşFaculty of Engineering, Department of Civil Engineering, Fırat University, Elazığ, Turkey

Jose Norambuena-ContrerasNottingham Transportation Engineering Centre, School of Civil Engineering, University of Nottingham, University Park, Nottingham, UK;LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, Concepción, Chile

Alvaro GarciaNottingham Transportation Engineering Centre, School of Civil Engineering, University of Nottingham, University Park, Nottingham, UK

Mehmet YılmazFaculty of Engineering, Department of Civil Engineering, Fırat University, Elazığ, Turkey

https://orcid.org/0000-0002-2761-2598

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ABSTRACT

In this study, four different additives (Styrene–butadiene–styrene (SBS), Trinidad Lake Asphalt (TLA), Iranian Gilsonite (IG) and American Gilsonite (AG)) were used in bitumen modification. The rheological properties of bitumen were improved with the additive usage, and the desired performance grade (PG 70-34) was achieved by using additives in pure bitumen (PG 58-34) at the indicated ratios. Wheel tracking tests and semi-circular bending tests were applied for hot mix asphalt (HMA) samples. The main results showed that all the additives increased resistance to permanent deformation of HMAs, and that TLA was the most effective additive. In addition, it was found from the semi-circular bending tests that deformation values of mixtures prepared with modified bitumens and subjected to long-term ageing decreased. As a result, long-term aged and modified bitumen mixtures exhibited more brittle behaviour. The increase in maximum load values led to an increase in the area under the load-strain curves. Thus, crack propagation resistance of mixtures prepared with modified binders was increased.

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ORCID

Mehmet Yılmaz http://orcid.org/0000-0002-2761-2598

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Effects of different bitumen modifiers on the rutting and cracking resistance of hot mix asphalts

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Effects of different bitumen modifiers on the rutting and cracking resistance of hot mix asphalts

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