Materiales de Construcción, Vol 67, No 327 (2017)

Ageing and temperature effect on the fatigue performance of bituminous mixtures

T. López-Montero, R. Miró

DOI: http://dx.doi.org/10.3989/mc.2017.04216

Abstract


The ageing of asphalt mixes, together with their exposure to low temperatures, causes a progressive increase of cracking. In this paper, the effect of ageing and temperature on the fatigue of asphalt concretes made with two types of binders, conventional (50/70) and polymer modified bitumen (PMB), is studied. For this purpose, specimens previously subjected to an accelerated laboratory ageing process were tested by a strain sweep test at different temperatures (-5ºC, 5ºC and 20°C). Results were compared with the obtained from the unaged specimens showing the relative importance of ageing, temperature and type of bitumen on the parameters that determine the fatigue life of the mixture. The mixtures behaviour becomes more brittle with ageing and the decrease of temperature. However, ageing hardly has an effect on fatigue at lower temperatures. In general, mixtures made with polymer modified bitumen have a better fatigue performance to ageing and temperature.

Keywords


Ageing; Temperature; Fatigue; Bitumen; Asphalt concrete

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References


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