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.
Highlights
Asphalt layers suffer a progressive deterioration when they are exposed to repeated loads caused by traffic and environmental conditions such as heat, wind, rain or ultraviolet radiation
The fatigue behaviour will be analyzed at different temperatures by applying a strain sweep test, called EBADE (18)
The mixture was manufactured from two different bitumens
Summary
Asphalt layers suffer a progressive deterioration when they are exposed to repeated loads caused by traffic and environmental conditions such as heat, wind, rain or ultraviolet radiation. Short-term ageing takes place at the time of manufacture and laying of the hot mix This stage is characterized by the mixture undergoing volatilization and oxidation very quickly (the process is carried out within hours). A new ageing procedure has been established within the framework of the RILEM technical committee This procedure involves ageing the loose mixture for 4 hours at 135°C in the case of short-term ageing. Piérard and Vanelstraete (11) developed a new test called BRRC ageing It consists of placing the loose mixture in the oven at 135°C for 1.5 hours for short-term ageing. The classical fatigue tests, described in the current standards (EN and ASTM), are time sweep tests They are usually based on the application of a cyclic load under controlled conditions of strain or stress until failure of the mixture occurs. The fatigue behaviour will be analyzed at different temperatures by applying a strain sweep test, called EBADE (the initials of the strain sweep test in Spanish, Ensayo de Barrido de Deformaciones) (18)
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