Performance of warm mix asphalt (WMA) mixture using nanoclay modified asphalt binder

Abdullah, Mohd Ezree (2014) Performance of warm mix asphalt (WMA) mixture using nanoclay modified asphalt binder. PhD thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Going towards green pavement construction, asphalt concrete industries consistently make effort to implement Warm Mix Asphalt (WMA). The aim of this research was to establish the WMA mixture using nanoclay modified binder according to Superpave mix design method. It started by modiSring the PG 64-28 asphalt binder with different percentages of Nanoclay A, Nanoclay B and Chemical warm asphalt additives. After modification, the modified binders were categorised as Nanoclay A Modified Binder (NCMB A), Nanoclay B Modified Binder (NCMB B) and Chemical Warm Asphalt Modified Binder (CWAA). The rheological characteristics of binders were evaluated using the SuperpaveTM rotational viscosity, dynamic shear rheometer, and bending beam rheometer test. The results indicated that NCMB B and CWAA significantly reduced mixing and compaction temperature. However, only NCMB B shows a significant incpse in rutting and fatigue resistance when compared to the virgin binder. In addition, the chemical bonding had changed in the tested binder after long term aging which suggest that the addition of modifier could delay the aging process. A total of 260 specimens were prepared to evaluate and compare the engineering properties of hot mix asphalt (HMA) and WMA mixtures using NCMB B and CWAA. Based on statistical analysis, it was observed that WMA mixtures produced at 30°C lower than conventional HMA for both modifiers showed a significant emissions reduction and have no significant difference on performance in term of rutting, fatigue, moisture susceptibility and resilient modulus (MR). Studies on correlation and regression analysis between various rheological modified asphalt binder and engineering properties of WMA mixtures containing NCMB B and CWAA were also conducted. It was found that a strong correlation exists between G*/sin 6 and rut depth. In conclusion, the introduction of NCMB I3 has a bright potential as a new environmentally WMA binder in future.

Item Type:Thesis (PhD)
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
ID Code:7887
Deposited By:En. Sharul Ahmad
Deposited On:11 Apr 2016 17:07
Last Modified:11 Apr 2016 17:07

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