Electronic Theses and Dissertations

Date of Award

1-1-2023

Document Type

Dissertation

Degree Name

Ph.D. in Engineering Science

First Advisor

Ahmed Al-Ostaz

Second Advisor

Ahmed Al-Ostaz

Third Advisor

Hunain Alkhateb

School

University of Mississippi

Relational Format

dissertation/thesis

Abstract

Asphalt is the most common material used for road construction; however, asphalt has its downsides. Asphalt roads deteriorate with time due to (age hardening) and susceptibility to moisture damage shortening asphalt roads’ service life span; Hence, asphalt roads need to be resurfaced every 15-20 years, depending on maintenance. Asphalt binder short comings can be remedied by incorporating graphene (GNPs) and modified graphene (MGNPs) into the asphalt binder matric. This research study the effect of different GNPs surface modification on asphalt binder properties and performance, with three main surface modifications; oxidation, octadecylamine and aminopropylIsooctyl POSS. It also suggests a different criterion to measure age hardening rate. Modifying GNPs is an important part of this research, with grafting relying on carboxyl group. Nitrating acid mixture method was also under study utilizing design of experiment. It was found that MGNPs improved rutting factor while reducing binder age hardening. Moreover, nitrating acid mixture method was found to produce moderate oxygen content with relatively low damage platelets with oxygen content depends on graphene grade used as precursor and nitric acid vol.%.

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