The effects of micro and nano size bauxite particles in modified asphalt binders and asphaltic mixtures
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 m...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2020
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7/1/24p%20HAMZA%20MOHAMED%20ABDULHAMED%20ELGHATAS.pdf http://eprints.uthm.edu.my/7/2/HAMZA%20MOHAMED%20ABDULHAMED%20ELGHATAS%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7/3/HAMZA%20MOHAMED%20ABDULHAMED%20ELGHATAS%20WATERMARK.pdf http://eprints.uthm.edu.my/7/ |
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| Summary: | 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. |
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