Performance modeling of Arabian asphalt using HP-GPC chromatography

(1996) Performance modeling of Arabian asphalt using HP-GPC chromatography. PhD thesis, King Fahd University of Petroleum and Minerals.


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In the Gulf countries, asphalt pavements show signs of high severity distresses in the early stages of service. One of the main factors contributing to these distresses is the asphalt cement. Asphalt cement is characterized by its viscous and elastic properties. Two tests are used in the Gulf countries to classify and test for the suitability of an asphalt cement for usage under certain loading and environmental conditions. They are penetration and viscosity. These tests, however, can't be used to predict the performance of the asphalt. SHRP has developed a new set of tests which has the ability to predict asphalt performance because it relies on fundamental asphalt properties. SHRP tests are time consuming and require expensive and complicated equipment set-up and highly trained operators. Therefore there is a need to find a simple, reliable, and fundamental test that can be used by asphalt manufacturers for process control and performance prediction. High Pressure Gel Permeation Chromatography (HP-GPC) is one of the most advanced techniques used in characterizing the molecular distribution of liquid materials. It is available in quite a number of local institutions and oil refineries. It is possible to use this device to predict asphalt performance if a set of models that relate produced HP-GPC profiles to performance properties can be developed. HP-GPC has not been used as a standard test for the evaluation of asphalt cement. In this study, Arabian neat asphalt samples were collected from the different asphalt producing refineries in the Gulf countries. An additional set of polymer modified samples was included in this study. All collected asphalt samples were subjected to two aging processes to simulate heating, mixing and compaction, and in-service aging. The asphalt samples at the different aging stages were subjected to rheological and performance-based testing. HP-GPC was used to produce profiles of the molecular size distribution of the test samples. Models were built to predict the rheological and performance-based properties from the produced HP-GPC profiles. These models will be used to determine the suitability of using a given asphalt for a specific environmental condition within the Gulf region.

Item Type: Thesis (PhD)
Subjects: Civil Engineering
Department: College of Design and Built Environment > Civil and Environmental Engineering
Committee Advisor: Al-Abdul Wahhab, Hamad I.
Committee Members: Bubshait, Khaled A. and Al-Ahmadi, H. M. and Al-Sabah, Walid S. and Ergun, Gokmen and Ali, Mohammed F.
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 13:47
Last Modified: 01 Nov 2019 13:50