6533b860fe1ef96bd12c3b51
RESEARCH PRODUCT
Effect of two novel bio-based rejuvenators on the performance of 50% RAP mixes - a statistical study on the complex modulus of asphalt binders and asphalt mixtures
Emmanuel ChailleuxAna Jiménez Del Barco CarriónR. Christopher WilliamsEric W. CochranNicholas MankeLaurent PorotJuliette BlancDavide Lo PrestiZahra Sotoodeh-niasubject
CARACTERISTIQUESMaterials science0211 other engineering and technologiesModulusBio basedMELANGE02 engineering and technologyBITUMEASPHALT MIXTURE CHARACTERISATIONRECLAIMED ASPHALT PAVEMENT[SPI.MAT]Engineering Sciences [physics]/MaterialsRECYCLAGE (MATER)ASPHALTE021105 building & construction0502 economics and businessmedicineSettore ICAR/04 - Strade Ferrovie Ed AeroportiStatistical analysisComposite materialCARACTERISATION PHYSICO CHIMIQUERIGIDITECivil and Structural Engineering050210 logistics & transportation05 social sciencesStiffnessBIO-REJUVENATORSSTIFFNESSasphalt mixture characterisation bio-rejuvenators reclaimed asphalt pavement stiffnessBiological materials[SPI.GCIV]Engineering Sciences [physics]/Civil EngineeringDynamic modelsAsphaltMATERIAU RECYCLECOMPOSITION DU MELANGEmedicine.symptomdescription
An experimental study was conducted to evaluate the effectiveness of two bio-additives as rejuvenators on the properties of asphalt mixtures containing 50% RAP and their binder constituents containing 37% RAP binder. Before mixing, the rejuvenators were blended with fresh bitumen and the extracted and recovered RAP bitumen, and changes in the rheological properties of the binders were assessed using performance grading (PG) criteria. The results showed that both rejuvenators could improve the low-temperature performance of the aged RAP binder and restore its low-temperature properties. Master curves for the unaged, RTFO-aged, and PAV aged blends were constructed using both the Christensen-Anderson-Marasteanu (CAM) model and the Sigmoidal models. A comparative statistical analysis conducted on the models indicated no significant difference between the measured and predicted complex modulus values at any aging conditions. The pairwise statistical comparison between the two models showed that at unaged conditions, they can perfectly overlap as the p-values were greater than the level of significance. However, for the PAV-aged binders, this behaviour appears to weaken due to the brittle behaviour of the binders. Further statistical analyses revealed no significant differences between the two models at unaged conditions, however, as the binders where subjected to aging, significant differences between the two models began to appear. Mixing was performed in two locations: lab and plant, while compaction was performed only in the lab. After mixing and compaction, mixtures were evaluated for their stiffness characteristics through dynamic modulus testing. Compared to the control mixture, rejuvenated mixtures showed lower dynamic modulus values specially at high temperatures. A statistical comparison between the lab-produced, lab-compacted mixtures and plant-produced, lab compacted mixtures showed that both the rejuvenation and the location of mixing were significant factors in the stiffness measurements.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-01 |