Speaker
Description
Abstract. Cold In-place Recycling (CIR) is a rehabilitation treatment that restores a flexible pavement structure. While there has been significant re-search in design and performance testing of CIR, there is limited considera-tion of performance during construction. This research validated the Stiff-ness Raveling Mechanism Test (SRMT) in the lab and in the field, as an in-expensive, easy way to quantify the curing of CIR. In the lab, CIR and Hot Mix Asphalt showed lower rebound heights at higher air voids, higher test-ing temperatures, and moisture conditioning. In the field, the SRMT had a good correlation to density during compaction, but the data was not accu-rate enough to establish roller pattern recommendations. The SRMT had a maximum rebound after approximately 20 hours of curing and then saw a small decrease over a five-day period, and was able to differentiate emulsi-fied asphalt types based on cohesion gain. Finally, based on the 24-hour field validation, it is recommended that a rebound height of 305-356mm (12-14 inches) could be specified for return to traffic.
