HP-GPC CHARACTERIZATION OF ASPHALT AND MODIFIED ASPHALTS FROM GULF COUNTRIES AND THEIR RELATION TO PERFORMANCE BASED PROPERTIES
H. l. Abdul Wahhab, Mohammad F Ali. I. M. Asi,
refineries in the Gulf countries include Ras Tanurra and
AL-Ahmadi refinery supplies all of the asphalt cement needed
for construction in the state of
BAPCO refinery, Bahrain- utilizes crude oils produced from Saudi oil fields and supplies asphalt cement needed for construction in Bahrain, Oman and parts of United Arab Emirates
The roadway network in Gulf countries has developed more rapidly than in many industrialized countries. The entire roadway network is built using flexible pavements due to the availability of relatively low cost asphalt binders The asphalt binder plays a significant role in pavement ability to withstand thermal and fatigue cracking and contribute to permanent deformation behavior Fatani et al in a study about permanent deformation in Saudi Arabia have concluded that the asphalt cement is responsible for a major part of rutting in the region, and that extreme weather conditions of the Gulf countries has promoted an inferior performance of asphalt concrete rnixes in the field.
Asphalt binders are theremo-visco-elastic materials where temperature and rate of load application has a great influence on their behavior. Asphalt consistency and hence ability to sustain and hold their fundamental cementing mechanism changes depending on temperature The pure asphalt lack the proper balance of viscous fluid-elastic sponge properties which usually occur due to an effective elastic network created by molecular association. In recent years various studies have shown that polymer modification can be successful in forming this viscous fluid-elastic sponge balance by creating molecular entanglement in asphalt.
This study was initiated to evaluate different locally available polymer materials in order to identify potential polymers to modify asphalts to satisfy the performance requirements in the Gulf countries' environmental conditions. The storage stability of the asphalt-polymer blends and the life cycle cost analysis of the polymer modification were also studied
Keywords. Modified Asphalts, HP-GPC Characterization, Gulf Countries Asphalts