Non-Destructive Testing of Cold In-place Recycled Materials at Very Young Age

摘要

Nowadays, Cold In-place Recycling (OR) is a pavement rehabilitation technique that is used extensively in Canada. Pavements rehabilitated with CIR are opened to traffic very soon after compaction. The characteristics of this very young material are unknown and complicated to test with the usual laboratory methods. The objective of this study is to test the characteristics of CIR materials at very young age. In order to do so, two non-destructive methods were utilized. First, a Light Weight Deflectometer (LWD) was used, then shear wave propagation tests (Vs) were performed on the same mixes that were left to cure at room temperature over a long period. In this paper, the development of a new shear wave propagation test apparatus is explained followed by the results and the analysis of the experimental plan. The method developed to measure shear wave velocity (Vs), which can be transformed into elastic modulus, is simple, rapid, and cost effective. The results show that it's possible to evaluate the change of behavior of CIR materials with time with Vs, and that those results can be linked with the modulus back-calculated from the LWD tests.