1. 1. 2. 3. 4. © Influence Of M-W Of LDPE And Vinyl Acetate Content Of EVA On The Rheology Of Polymer Modified Asphalt Hussein, IA; Iqbal, MH; Al-Abdul-Wahhab, HI SPRINGER, RHEOLOGICA ACTA; pp: 92-104; Vol: 45 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary Asphalt binder was modified by low-density polyethylene (LDPE) and ethyl vinyl acetate (EVA) polymers to investigate the structure-property relationships of polymer-modified asphalt (PMA). The PMA was prepared in a high-shear blender at 160 degrees C. The optimum blending time (OBT) for each polymer was determined following a separate investigation. OBT was influenced by M-w, MWD, and polymer structure. The influence of M-w of LDPE and vinyl acetate (VA) content of EVA on PMAs was studied by rheological tools. Polymer modification improved the rheological properties of base asphalt. EVA-PMAs were found to be less temperature sensitive than LDPE-modified asphalts. LDPE modification increased flow activation energy (E-a) but EVA modification decreased E-a. Both VA content and M-w of LDPE have influenced the storage stability of PMAs. The low-temperature properties of PMAs and short ageing tests were not influenced by polymer type. On the other hand, the high-temperature properties of PMAs were strongly influenced by M-w of LDPE and VA content of EVA. Overall, EVA with low VA content showed the best temperature resistance to high- temperature deformations, the highest upper service temperature as well as the best storage stability. References: ADEDEJI A, 1996, POLYM ENG SCI, V36, P1707 AITKADI A, 1996, POLYM ENG SCI, V36, P1724 ALDUBABE IA, 1998, J MATER CIVIL ENG, V10, P161 ALI MF, 1999, PET SCI TECHNOL, V17, P125 Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa

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3. © For pre-prints please write to: ihussein@kfupm.edu.sa Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa