Onderwerp: Bezoek-historie

Durability related investigation into porous asphalt
Publicatiedatum:01-01-2008

Dit onderwerp bevat de volgende rubrieken.

Auteur(s)

J.L.M. Voskuilen ; Ministerie van Verkeer en Waterstaat, Rijkswaterstaat, Dienst Weg- en Waterbouwkunde (RWS, DWW); E.T. Hagos, A.A.A. Molenaar, M.F.C. van de Ven ; TU-Delft

 

Samenvatting

 

Porous Asphalt (PA) pavement layers are very sensitive to traffic loading and climatic actions. The durability of PA is measured in terms of its resistance to raveling, i.e. the loss of aggregates from the pavement surface. The two main types of failure in PA are the loss in the cohesive strength (the binding material) and/or the adhesive strength (the interface between the binding material and the aggregates). Bitumen samples were investigated to study the effect of age hardening on the binder cohesive properties and the implications on the mixture performance. Aging of bitumen was conducted using artificial lab aging methods to compare properties with bitumen recovered from field core specimens. The asphalt cores were taken from road sections after construction, 1, 3, 7, and 12 years of service both from the heavy trafficked lane (Slow Lane, SL) and the emergency lane EL (Shoulder, SH without traffic). Rheological and mechanical tests were conducted on the bitumen samples and the field asphalt mixes. Comparison of binder rheological properties of aged materials with unaged 70/100 pen bitumen used as reference shows that age hardening increases the stiffness modulus of the material and decreases its relaxation potential. The results of Direct Tensile Test (DTT) confirm the decrease in relaxation ability of aged materials. Mechanical tests performed on the field cores reveal that damage development in the mixes is apparent regardless of traffic loading, which is directly linked to damage due to environmental actions. Aging accelerates the sensitivity to ravelling of PA leading to cohesive damage (brittle behaviour).

 

Annotatie

12 p.
Met lit.opg.
Bijdrage voor de CROW Infradagen 2008
Paper 2007 Athene

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