Abdulhamed Elghatas, Hamza Mohamed (2020) The effects of micro and nano size bauxite particles in modified asphalt binders and asphaltic mixtures. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.
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Abstract
Yearly increasing of traffic volume has caused congestion on road pavement and it’s likely to effects the pavement performance such as reduce in strength and loss structural integrity. Due to these phenomena, road construction industry need to focus how to improve the characteristics of asphalt mix in order to reduce the pavement deteriorations. This study aims to evaluate the effects of Malaysian Micro bauxite powders (MBP) and Nano bauxite powders (NBP) with 3%, 5% and 7% by mass of bitumen. Conventional bitumen 80/100 penetration grade was used as the base binder. The modified asphalt binder was evaluated on the fundamental physical properties. Performance of modified asphalt mixtures prepared with MBP and NBP were evaluated for resilient modulus, dynamic creep and rutting susceptibility. In this study, the size of MBP and NBP used were less than 75 μm and in ranges of 10 nm to 20 nm, respectively. The result shows that the addition of 7% MBP and NBP in asphalt binder have decreased the penetration value and increased the softening point by 18.6% and 23.6%, and 6.5% and 10.8%, correspondingly. This indicates that incorporation of 7% MBP and NBP in asphalt binder are capable to increase the stiffness of asphalt binders compared to virgin binder. However, the modified asphalt binder with 5% MBP and NBP exhibit higher complex modulus (G*) and phase angle (δ) compared to the modified binder with 7% MBP and NBP regardless of test temperature. Thus, incorporation of 5% MBP and NBP in asphalt binder give a higher value of G*/sin δ which result higher binder stiffness to resist the rutting. In addition, the resilient modulus of modified asphalt mixture incorporation of 5% MBP and NBP for unaged and short-term aged tested at 25oC and 40oC have increased by 16.5% and 14.4%, and 19.9% and 18.7%, respectively. The permanent deformation and rutting of asphalt mixture incorporated with 5% MBP and NBP consistently resulted lowest values for both unaged and short-term aged compared to the other specimens. It can be concluded that the incorporation of 5% MBP and NBP in virgin asphalt binder give the best performance of the modified asphalt mixture.
| Item Type: | Thesis (Doctoral) |
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| Subjects: | T Technology > TE Highway engineering. Roads and pavements > TE210-228.3 Construction details. Including foundations, maintenance, equipment |
| Divisions: | Faculty of Civil Engineering and Built Environment > Department of Civil Engineering : Building and Construction Engineering |
| Depositing User: | Mrs. Sabarina Che Mat |
| Date Deposited: | 06 Jun 2021 07:36 |
| Last Modified: | 06 Jun 2021 07:36 |
| URI: | http://eprints.uthm.edu.my/id/eprint/7 |
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