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Laboratory study on fatigue performance of recycled hot mix asphalt mixture

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Document pages: 10 pages

Abstract: This paper introduces and analyzes the fatigue test results of road recycled hot mix asphalt mixture. Based on the rotary compaction and indirect tensile strength test, the mix design program optimizes nine different mix proportions, taking into account the traditional limestone and recycled asphalt pavement (RAP), which are used in different quantities, with an aggregate weight of up to 40 . A standard asphalt and two polymer modified adhesives are used in the production of mixtures. The fatigue study was carried out using four point bending tests, each at 20 ° C and 10 ° C   Hz. The experimental data are described in detail by using the empirical stiffness reduction method and energy ratio method based on the concept of dissipated energy Unaged and aged specimens were checked, to analyse the ageing effects on the fatigue performance. In comparison with the control mixes, produced only with limestone, improved fatigue performance was noticed for the mixtures prepared with RAP, especially when made with polymer modified binders, under both aged and unaged conditions. Both the approaches adopted for the experimental data analysis have outlined the same ranking of the mixes.

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