Carl Robertus

Bio: Carl Robertus is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 1 citations.

Rheological and chemical properties of field aged binders and their variation within the wearing course

Abstract: Field ageing is investigated based on recovered binders. Fifteen sections were considered, consisting of unmodified and polymer-modified binders (PmB). Binders were recovered from the wearing cours...

Parametric analysis and field validations of oxidative ageing in asphalt pavements using multiphysics modelling approaches

Abstract: Oxidative ageing in fi eld asphalt pavements is a complex process with coupled multiple physics. This parametric study uses Multiphysics modelling approaches to evaluate the e ff ects of material thermal properties, air voids content and distribution, mastic coating thickness, oxygen accessibility and binder oxidative kinetics on the spatial and temporal evolution of the oxidative ageing in the asphalt pavements. Results suggest that increasing the thermal conductivity of asphalt layers leads to a lower ageing gradient. The variations of base and subgrade layers ’ thermal properties cause little to no e ff ects on the oxidative ageing. A high activation energy of the asphalt binder (e.g. by adding anti-ageing additives) reduces the oxidative ageing signi fi cantly. Asphalt layers built on unbound granular base will experience greater overall ageing with a C-shaped ageing gradient compared to that built on treated base. Air voids content of <5% yields limited oxidative ageing. Five to nine percent air voids generate a gradually increased oxidative ageing with an obvious gradient across pavement depth. Air voids content beyond 9% leads to a consistently high oxidative ageing due to a full access to the oxygen. Finally, the fi ndings were validated using available literature results and fi eld data from 14 European road sections.