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Characterization of Cold In-Place Recycled Materials at Young Age Using Shear Wave Velocity

The characterization of cold recycled pavement materials at an early stage of their life, right after compaction, is difficult, especially if classical tests are used. Indeed, these materials at a very young age behave like granular materials, which affect the feasibility of the usual tests done on bituminous materials. Nondestructive techniques using wave propagation can be used to overcome this difficulty. The aim of this study is to evaluate if a method based on the spectral analysis of mechanical shear wave generated by piezoelectric rings (P-RAT method) can be used to characterize a cold in-place recycled material treated with an asphalt emulsion at a young age. Shear waves are used here because of the water content of such materials at early age. Such material can contain 10 % of water by volume before compaction. Shear wave allows the characterization of the skeleton of aggregates and bituminous binder (i.e., the asphalt concrete) with no interference from the pore water, thanks to the zero shearing resistance of the water. The tests show a strong link between water disappearance inside the specimen during the cure and the evolution of shear wave propagation velocity in the specimen. Moreover, water disappearance can be easily related to the evolution of FOOPIPEE*FOOPIPE in the specimen, allowing the characterization of this material using the evolution of the shear wave propagation velocity.