The influence of aggregate on moisture susceptibility in terms of asphalt-aggregate interactions

Title: The influence of aggregate on moisture susceptibility in terms of asphalt-aggregate interactions
Author(s): S.-C. Huang, J. F. Branthaver, R. E. Robertson
Paper category : conference
Book title: Sixth International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials
Editor(s): M. N. Partl
Print-ISBN: 2-912143-35-7
e-ISBN: 2912143772
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 177 - 183
Total Pages: 7
Nb references: 6
Language: English

Abstract: Experiments were conducted to investigate the effects of water on asphalt-aggregate mixtures. Both neat and oxidatively aged asphalts were studied. Results have shown that the moisture susceptibility of a neat asphalt-aggregate system is both asphalt source and aggregate source dependent. Highly siliceous aggregates tend to form mixtures that are susceptible to water damage no matter which asphalt they are combined with. In the systems reported here, oxidative aging improves resistance to water stripping, even in mixes of siliceous aggregates. It can be concluded that the chemical composition of both asphalt and aggregates are important for bond formation at asphalt-aggregate interfaces and for resistance of the bonds to water attack. In addition, the results suggest that polar additives similar to those generated during oxidative aging may prove to be effective anti-strip agents. The results also suggest that recycled pavement may have an advantage regarding resistance to water action. Asphalt-water-aggregate interactions depend mainly on the affinity between components of the binder, water, and the surfaces of aggregates.

Online publication: 2003-03-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143772.020