Developing new chemical–rheological models and chemical–durability indices of bitumen
Significant correlation among chemical properties, rheological characteristics and durability of bitumen is very important in evaluating and modifying bitumen. However, a number of previous studies found inconsistent correlation. Therefore, a study on developing new chemical-rheological models and...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/2200/1/24p%20MADI%20HERMADI.pdf http://eprints.uthm.edu.my/2200/2/MADI%20HERMADI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2200/3/MADI%20HERMADI%20WATERMARK.pdf |
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| Summary: | Significant correlation among chemical properties, rheological characteristics and
durability of bitumen is very important in evaluating and modifying bitumen. However, a number of previous studies found inconsistent correlation. Therefore, a
study on developing new chemical-rheological models and chemical-durability
indices was carried out. Two bitumen fractionation method, Rostler and Corbett
methods were used to extract each chemical fraction of bitumen. A number of
experiments were conducted to evaluate the effect of each chemical fraction on
bitumen rheology such as the effect of asphaltenes, polar aromatics, naphthene
aromatics, nitrogen bases, first acidaffins, second acidaffins and paraffins on elastic
modulus (G’), viscous modulus (G”) or fatigue factor (G*sin[δ]), and rutting fator
(G*/sin[δ]). Two bitumen from different sources, namely Petronas petroleum
bitumen and Buton rock asphalt (BRA) bitumen, were used. New chemical�rheological models were formulated to estimate the bitumen rheology in corporating
parameters which are G’, G” or (G*sin[δ]), and (G*/sin[δ]) based on the chemical
properties. Furthermore, new chemical durability indices that may indicate the
ageing rate of bitumen during short-term and long-term ageing were also formulated.
Based on statistical analyses, the models and the indices, which were developed by
using chemical properties according to Rostler method were found to be invalid
because the real and the predicted rheology were significantly different. While
according to Corbett method the models and the indices were valid because the
differences is not significant since t-score of the models and the indices were
maximum 2.679 and 2.119 or less than t-critical 2.797 and 2.861 respectively). The
novelties of this study are the new models and the new indices can be used to predict
the bitumen rheology and ageing rate based on the chemical composition.
Furthermore, they are very important as guides in modifying a bitumen chemical
composition to produce a bitumen mixture with the desired rheology and short-term
or long-term ageing rate |
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