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Influence of Testing Environment on Fluctuation of Initial Stiffness of Asphalt Concrete
Abstract
Monthly variation in the environment and the daily fluctuation in the temperature exhibit thermal stresses in the pavement in addition to the vehicular loading. In the present investigation, asphalt concrete mixtures were prepared with optimum binder content and compacted in a slab mold by roller. Beam specimens were obtained from the slab samples and tested for fatigue at three pavement operating temperature of (5, 20, and 30) °C and under three constant strain levels of (250, 400, and 750) microstrain. The fluctuation of the percent initial flexural stiffness was monitored through the test until failure. It was observed that the fluctuation of initial stiffness is in the range of (200-5) %, at various microstrain levels and under various testing environment and it is restricted as the microstrain level increases. The fatigue life increases as the testing temperature rises while it decline as the microstrain level increases. It was concluded that high constant strain level of 750 microstrain was able to significantly restrict the fluctuation of initial stiffness regardless of the testing environment.
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