Characterisation of warm asphalt mixtures with addition of reclaimed asphalt pavement materials

This thesis studies the characterisation of warm asphalt mixtures with the addition of reclaimed asphalt pavement materials. The effect of warm additives Sasobit, Rediset WMX and Rediset LQ on the viscosity of bitumen was investigated in detail. Furthermore, the effect of these additives on the rheological properties of bitumen was also identified using a dynamic Shear Rheometer. After proving that warm additives such as Sasobit and Rediset WMX improved the fatigue life of asphalt binder, emphasises were paid to investigate nano-mechanical properties of warm modified bituminous binders and mix. Therefore this study also presents an investigation into the impact of warm additives on topography, modulus, deformation and adhesion of warm-modified bituminous binders using atomic force microscopy with the peakForce quantitative nano-mechanical mapping modality. The effect of production temperatures on the performance of warm mix asphalt was further investigated. Nanoindentation, which is an advanced technique, was used to study the effect of warm additives on the nano-mechanical properties of asphalt mixture phases, aggregate, interfacial transition zone (between aggregate and binder) and mastic. The implications of this work for industry are that, firstly, warm additives offer a superior performance in producing asphalt mixtures that have better fatigue performance than traditional hot mix asphalt. Moreover, the study revealed that warm additives improve the strength bond between aggregate and binder. Secondly, highway agencies are advised to specify a minimum production temperature for warm mix asphalt to reach acceptable mixture stability. A complete blending between reclaimed asphalt pavement and virgin materials can be achieved using the proposed protocol; therefore a more sustainable and cost-effective pavement structure can be constructed.

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  • Accession Number: 01660762
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Feb 20 2018 10:43AM