Performance of asphalt mixtures containing steel slag aggregate and synthetic fibers
Utilization of waste materials in civil engineering applications has been documented as an effective method to preserve environment and natural resources. One of the well-known waste materials is steel slag aggregate, which is a byproduct of steel manufacturing. However, volume instability and hi...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2019
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/42/1/ADHAM%20MOHAMMED%20HEZAM%20ALNADISH%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/42/2/24p%20ADHAM%20MOHAMMED%20HEZAM%20ALNADISH.pdf http://eprints.uthm.edu.my/42/3/ADHAM%20MOHAMMED%20HEZAM%20ALNADISH%20WATERMARK.pdf |
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| Summary: | Utilization of waste materials in civil engineering applications has been
documented as an effective method to preserve environment and natural resources.
One of the well-known waste materials is steel slag aggregate, which is a byproduct
of steel manufacturing. However, volume instability and high density are
the main drawbacks of using steel slag aggregates. In this study, steel slag
aggregates were immersed in water for six months to minimize the free lime and
free magnesia content, which are mainly responsible for the volume instability.
Furthermore, the granite aggregates were replaced by electric arc furnace (EAF)
steel slag aggregate with different proportions to identify the suitable substitution
in terms of superior performance. Subsequently, the asphalt mixtures incorporated
the appropriate proportion of the steel slag aggregates were reinforced with
polyvinyl alcohol (PVA), acrylic, and polyester fibers at different dosages of 0.05,
0.15, and 0.3% by weight of the aggregates, respectively. The conducted
performance tests were resilient modulus, dynamic creep, rutting depth, moisture
susceptibility, and cracking resistance. The findings of this study showed that the
free lime and free magnesia content in the treated steel slag aggregate have
significantly decreased. On the other hand, the asphalt mixtures incorporated
coarse steel slag aggregate exhibited the best performance than the other
substitutions. Furthermore, introducing synthetic fibers have dramatically
enhanced the cracking resistance. The higher the fiber content, the higher the
resistance to cracking. Additionally, the outputs of the permanent deformation
tests showed that as the fibers dosages increase, the deformation increases due to
the densification. Moreover, the asphalt mixtures performance incorporating
0.15% of synthetic fibers possesses the ability to decrease the thickness of the
asphalt layer by about 10%. In conclusion, improving the performance of asphalt
mixtures through utilization of steel slag aggregate and synthetic fibers is a
successful approach in terms of extending the service life of asphalt layer. |
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