Effect of Ageing and Water Action on the Cracking Resistance of Asphalt Mixtures
Cracking in asphalt layers is one of the most frequent distress mechanisms in flexible pavements due to thermal stresses and traffic loads. Furthermore, the ageing phenomenon along with moisture damage are the key factors for evaluating the asphalt mixture cracking resistance. The effect of ageing and water action on the cracking resistance of an asphalt mixture is studied in this paper. To this end, an asphalt concrete mixture, manufactured with two different bitumens (conventional and polymer modified binders), is subjected to ageing in the laboratory. Then, specimens are prepared with the aged mixture and subjected to the action of water. Unaged, aged and water-aged specimens are subjected to a direct tensile test (Fénix test) at different temperatures to obtain the variation of the fracture energy and toughness under these conditions.
KeywordsFracture energy Fénix test Ageing Moisture damage
The authors would like to thank the Ministerio de Economía y Competitividad (Spain) for its assistance in the project PROFIS (BIA2012-36508), established within the framework of the VI Plan Nacional de Investigación Científica, Desarrollo e Innovación Tecnológica, co-financed with funds from the European Regional Development Fund (ERDF) of the European Union. The work of the first author was partially funded by the Ministerio de Economía y Competitividad, Spain (Research Grant BES-2013-065678). The authors would also like to acknowledge the company CEPSA for supplying and characterizing the bitumen used in this study.
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