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Development of Polymer Modified Pelletised Bitumin for Utility Reinstatements and Emergency Pothole Repair

Al Hawesah, H (2022) Development of Polymer Modified Pelletised Bitumin for Utility Reinstatements and Emergency Pothole Repair. Doctoral thesis, Liverpool John Moores University.

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Abstract

The quality of asphalt pothole repair in carriageways depends on several important factors, such as the selection of patching material and the choice of repair technique. Conventional hot mix plants operate to support large paving projects, making production more economic with high volume output. When small repairs and maintenance are needed, it can be challenging to maintain small quantities of hot asphalt at a sufficient temperature, especially in the case of winter maintenance. Consequently, the repair materials cannot be compacted to the desired level on some occasions. Thus, producing high quality asphalt materials for low-volume and hand-laid applications including potholes patching and utility reinstatements has lways been a problem. This research aimed to develop a pelletised polymer modified bitumen (PPMB) with reduced temperature sensitivity for low volume applications. The effect of the developed binder PPMB on the asphalt has been evaluated in terms of stiffness, permanent deformation (wheel track test, creep test and indentation test) and fatigue life test, durability (water sensitivity and freeze-thaw cycle) in comparison with the conventional patching materials. The results showed that the highest penetration index (low temperature sensitivity) has been achieved by modifying bitumen with 20% rubber and 2% wax to produce polymer modified bitumen (PMB). Hence, the developed PMB has been incorporated with 5% filler (limestone) and then pelletised and coated with 1% paper sludge ash to produce PPMB. The outcomes showed that PPMB improved the asphalt properties in terms of stiffness, permanent deformation and fatigue life test, water sensitivity and freeze-thaw cycle; this is due to the development of a strong bonds between the PPMB and the aggregate resulting in stronger and more durable asphalt compared to the traditional hot mix asphalt. Furthermore, the self-compacted mastic asphalt has been developed by incorporating PPMB and fine aggregate. The results demonstrated that modifying the mastic asphalt with 2% gilsonite and 3% low density polyethene has improved the sensitivity to permanent deformation (creep test, wheel track test and indentation test), resistance for water sensitivity and long-term ageing compared to the unmodified mastic asphalt. This implies that the modified mastic asphalt could be used in heavy traffic due to its mechanical and durability properties. The overall results indicated that using the PPMB to produce asphalt and modified mastic asphalt is a successful alternative to the traditional patching materials in different applications.

Item Type: Thesis (Doctoral)
Uncontrolled Keywords: polymer modified asphalt; asphalt pavement maintenance; Pavement Repair; pothole patching
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TE Highway engineering. Roads and pavements
Divisions: Civil Engineering & Built Environment
Date Deposited: 20 Jan 2022 12:32
Last Modified: 20 Jan 2022 12:32
DOI or Identification number: 10.24377/LJMU.t.00016053
Supervisors: Sadique, M, Harris, C and Al Nageim, H
URI: https://researchonline.ljmu.ac.uk/id/eprint/16053

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