Durability of asphalt mixtures: Effect of aggregate type and adhesion promoters

Asphalt road–pavements are sensitive to water ingress, which degrades the bitumen to aggregate adhesion, promoting failure. The effects of water on a range of asphalt systems have been quantified using peel tests. The bitumen binder on an aluminium backing was peeled from the aggregate fixed arm and...

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Bibliographic Details
Published in:International journal of adhesion and adhesives 2014-10, Vol.54, p.100-111
Main Authors: Cui, Shuang, Blackman, Bamber R.K., Kinloch, Anthony J., Taylor, Ambrose C.
Format: Article
Language:English
Subjects:
Adhesion
Aggregates
Asphalt
Bitumens
Durability
Failure
Fracture
Granite
Limestone
Marble
Peel
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Summary:Asphalt road–pavements are sensitive to water ingress, which degrades the bitumen to aggregate adhesion, promoting failure. The effects of water on a range of asphalt systems have been quantified using peel tests. The bitumen binder on an aluminium backing was peeled from the aggregate fixed arm and the fracture energy was determined. In dry conditions, failure was cohesive within the bitumen, but became mainly interfacial between the bitumen and aggregate after immersion in water. The effect of water on the adhesion of bitumen to three aggregates (limestone, marble and granite) was evaluated. Acidic aggregates (granite) showed a greater loss of adhesion than basic aggregates (limestone and marble) under wet conditions. The porosity of the aggregates, although shown to be significant, was less important than their chemical composition. The interfacial adhesion in wet conditions can be improved by mixing a silane, amine or rubbery polymer into the bitumen.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2014.05.009