Assessment of Design Parameters and Construction Requirements for Full Depth Reclamation Projects with Cement.

摘要

The ability to efficiently rehabilitate and maintain the State of Vermont’s Highway infrastructure in a cost-effective manner is a daunting task. Historically, pavement overlay treatments were specified because it was a rapid low cost solution to poor ride conditions. While effective at correcting surface defects, thin overlays are unable to address inadequate road base strength and thicker overlays are cost prohibitive. The Agency of Transportation (VTrans) has employed a reclaimed stabilized base method to add strength to the highway base as a cost effective approach to highway rehabilitation. The Agency has a growing interest in using non-destructive evaluation (NDE) methods as a means to evaluate the quality of the reclaiming process. NDE can also provide a more rapid test result depending on the technology applied. The results of this research have shown that the Clegg Impact Soil Tester (CIST) proved to be a reliable means to test the quality of the reclaimed stabilized base quickly without causing damage. The other non-destructive testing methods utilized also proved to have value in certain circumstances. Where the Agency has used cores to test for the compressive strength of the subbase material, the quality of the coring can be poor, providing a wide variation with the testing results. The testing results obtained from the non-destructive methods used in this research proved to have less variation than that of the cores.