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https://ptsldigital.ukm.my/jspui/handle/123456789/487241Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Nur Izzi Md Yusoff, Assoc.Prof. Ts. Ir. Dr. | |
| dc.contributor.author | Faridah Hanim Khairuddin (P80202) | |
| dc.date.accessioned | 2023-10-11T02:31:03Z | - |
| dc.date.available | 2023-10-11T02:31:03Z | - |
| dc.date.issued | 2022-02-09 | |
| dc.identifier.other | ukmvital:130922 | |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/487241 | - |
| dc.description | In recent years, bitumen has experienced a rapid increase in price and declining of available quantities. Another issue on bitumen is the higher temperature of mixing and compacting needed for conventional Hot Mix Asphalt. This research aims to investigate the applicability of utilising bio-oils as a modifier in bitumen with the addition of Warm Mix Asphalt (WMA) chemical additive namely Cecabase. Physical, chemical, morphology, thermal and adhesion characteristics of the developed polyurethane modified bitumen (PUMB) with Cecabase were evaluated under moisture and ageing conditions. In this research, palm kernel oil-based polyol (PKOp) was used and added with 2,4-diphenylmethane diisocyanate (MDI) to obtain polyurethane (PU) where this process undergoes prepolymerisation method. PU were then mixed with a 60/70 penetration grade bitumen where 13 experiments design layout were produced using Central Composite Design for each type of PUMB to obtain optimum value. The optimum amount of PU has been determined to be 3 wt.% based on the result of Response Surface Method analysis; the predicted value for the optimum condition is consistent with the measured values. Next, PUMB produced at optimum value were blended with Cecabase at 0.5 wt.% to develop PUMB/Cecabase (PUMB/C). Results showed PU increased the stiffness of bitumen either with or without the addition of Cecabase. Inclusion of PU into bitumen increased its viscosity, which consequently improved rutting resistance. However, adding Cecabase to PUMB reduced its viscosity, and this resulted in decreasing the mixing and compacting temperatures while simultaneously increasing the fatigue resistance of the mixtures. All modified bitumen were storage stable blends at high-temperatures. Thermogravimetry analysis showed that the addition of PU and Cecabase has limited effect on the thermal stability of the bitumen. Raman spectra analysis revealed that modified bitumen did not change the order structures of the pristine bitumen. This is consistent with the result from FTIR analysis, which showed the absence of chemical interaction in the modified bitumen. Surface free energy (SFE) test conducted showed total SFE component of PUMB/C gives the highest value of SFE; 17.63 and 18.28 mJ/m2 under short term ageing and long term ageing respectively. The increasing in total SFE showed a good adhesion between the modified bitumen and aggregates. In addition, it was highlighted that the addition of Cecabase improved the work of adhesion of the bitumen. AFM analysis revealed a reduction on bee-structure topography and surface roughness value due to ageing and wet conditions. Resilient modulus (MR) test revealed that the addition of PU and Cecabase at different temperature and pulse repetition loading effect the MR values. PUMB and PUMB/C exhibit higher MR value when compared to base bitumen showing an improvement in resistance towards fatigue and rutting of the mixture. As for dynamic creep testing, the inclusion of PU and Cecabase as modifier has decrease the permanent deformation of the mixture. With this finding, the addition of PU incorporating with Cecabase in bitumen supports the benefits of using this alternative material as modifier in bitumen and for WMA application.,Ph.D | |
| dc.language.iso | eng | |
| dc.publisher | UKM, Bangi | |
| dc.relation | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | |
| dc.rights | UKM | |
| dc.subject | Universiti Kebangsaan Malaysia -- Dissertations | |
| dc.subject | Dissertations, Academic -- Malaysia | |
| dc.subject | Polyurethane/cecabase modified bitumen | |
| dc.subject | Asphalt mixtures | |
| dc.subject | Asphalt emulsion mixtures | |
| dc.title | Performance characteristics of polyurethane/cecabase modified bitumen and asphalt mixtures for warm mix asphalt application | |
| dc.type | Theses | |
| dc.format.pages | 282 | |
| Appears in Collections: | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_130922+Source01+Source010.PDF Restricted Access | 5.32 MB | Adobe PDF |  View/Open |
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