A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Moisture-Induced Debonding Mechanisms in Asphalt Mixtures
Abstract The mechanism of moisture-induced debonding in asphalt mixtures is described using data obtained from pull-off and direct tensile tests of aggregate-mastic bonds and miniature 20 mm diameter cored asphalt mixture specimens, respectively. Moisture conditioning using deionised water was conducted at multiple temperatures for periods of up to 40 days. Analyses of the results led to the development of a novel framework for describing moisture-induced debonding in asphalt mixtures in moisture-susceptible aggregates. Damage models describing debonding as cohesive damage in the bulk asphalt and/or adhesive failure at the aggregate-mastic interface resulting from monotonic tensile loading were derived based on load versus conditioning time. Debonding at the aggregate-bitumen interface was found to be the main mechanism of moisture-damage in the moisture-susceptible acidic aggregates that were tested. The trends in debonding with conditioning time was found to be neither test-mode (pull-off versus direct tension) nor conditioning temperature (20 °C versus 60 °C) dependent which suggest the presence of moisture at the aggregate-bitumen interface is a key factor influencing the mechanism of moisture-induced debonding in asphalt mixtures.
Moisture-Induced Debonding Mechanisms in Asphalt Mixtures
Abstract The mechanism of moisture-induced debonding in asphalt mixtures is described using data obtained from pull-off and direct tensile tests of aggregate-mastic bonds and miniature 20 mm diameter cored asphalt mixture specimens, respectively. Moisture conditioning using deionised water was conducted at multiple temperatures for periods of up to 40 days. Analyses of the results led to the development of a novel framework for describing moisture-induced debonding in asphalt mixtures in moisture-susceptible aggregates. Damage models describing debonding as cohesive damage in the bulk asphalt and/or adhesive failure at the aggregate-mastic interface resulting from monotonic tensile loading were derived based on load versus conditioning time. Debonding at the aggregate-bitumen interface was found to be the main mechanism of moisture-damage in the moisture-susceptible acidic aggregates that were tested. The trends in debonding with conditioning time was found to be neither test-mode (pull-off versus direct tension) nor conditioning temperature (20 °C versus 60 °C) dependent which suggest the presence of moisture at the aggregate-bitumen interface is a key factor influencing the mechanism of moisture-induced debonding in asphalt mixtures.
Moisture-Induced Debonding Mechanisms in Asphalt Mixtures
Apeagyei, Alex K. (author) / Grenfell, James RA. (author) / Airey, Gordon D. (author)
2016-01-01
7 pages
Article/Chapter (Book)
Electronic Resource
English
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