Abstract
In this paper, the possibility of improving the global response of asphalt materials for pavement applications through the use of hydrated lime and Electric Arc-Furnace Steel Slag (EAFSS) was investigated. For this purpose, a set of asphalt mortars was prepared by mixing two different asphalt binders with fine granite aggregate together with hydrated lime or EAFSS at three different percentages. Bending Beam Rheometer (BBR) creep tests and Dynamic Shear Rheometer (DSR) complex modulus tests were performed to evaluate the material response both at low and high temperature. Then, the rheological Huet model was fitted to the BBR creep results for estimating the impact of filler content on the model parameters. It was found that an addition of hydrated lime and EAFSS up to 10% and 5%, respectively, results in satisfactory low-temperature performance with a substantial improvement of the high-temperature behavior.
Highlights
Low-temperature cracking represents one of the major distresses for asphalt pavement built in cold regions such as northern U.S and northern Europe [1,2]
A simple solution to this distress is given by the application of softer asphalt binders, with considerably low Performance Grade (PG) [4] and better relaxation capabilities
A visual inspection of the two plots suggests that for low volume content of hydrated lime and Electric Arc-Furnace Steel Slag (EAFSS) both creep stiffness and m-value of mortars are in the same order of magnitude of the original binder, while a significant increase of S(60 s) coupled to a considerable decrease of m(60 s) are observed when moving to higher particles concentration
Summary
Low-temperature cracking represents one of the major distresses for asphalt pavement built in cold regions such as northern U.S and northern Europe [1,2]. A considerable increase in thermal stress is observed up to the material strength limit, beyond which cracks start developing on the pavement surface. Other phenomena, such as traffic loading and freeze-thaw cycles can further accelerate the structural deterioration eventually leading to premature failure [3]. A simple solution to this distress is given by the application of softer asphalt binders, with considerably low Performance Grade (PG) [4] and better relaxation capabilities This may potentially compromise the high-temperature response of the pavement inducing undesirable rutting phenomena. This is especially true for geographical location where extreme temperature variations are experienced between summer and winter, for which even a wide PG range cannot fully guarantee satisfactory pavement response
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