Design of Cold-In-Place Recycling using Superpave gyratory compactor
The main objective of this study is to validate the proposed performance based seven step mix design procedure for Cold-In-Place Recycling using RAP from different sources and to evaluate the mechanical characteristics and performance of the designed CIR mixtures.The representative samples of Reclaimed asphalt pavement (RAP) were obtained from milling of streets from three different locations around Reno area (Redrock, Matterhorn and Alturus). Two RAP gradations which satisfy the requirement of the Pacific Coast Conference on Asphalt Specification (PCCAS) were chosen for the validation purpose. The mix designs were performed without using additives, with 1.0% hydrated lime and 0.5% Portland cement in order to compare the impact of additives on the performance of each mixes. For all three sources of RAP, the mix design was performed in accordance with the proposed seven step mix design procedure to come up with the best two combinations of emulsion content and water content.The designed CIR mixes were further evaluated for moisture susceptibility and raveling test. Out of the two combinations, the one which performed better in moisture susceptibility and raveling test was chosen as an optimum emulsion content and optimum water content. The tensile strength of CIR mixes without additives; with 1.0% hydrated lime and 0.5% Portland cement were also compared at different freeze-thaw cycles for some mixes. Once the optimum emulsion content and water content were decided for all the mixes, dynamic modulus property of all CIR mixtures were evaluated and the corresponding master curves were developed for by using time-temperature superposition principle. Furthermore, the rutting resistance of all the CIR mixtures were also evaluated in term of the flow number.
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