| Recently, TxDOT has experienced an increase in the number of pavement failures that may be attributed to the poor quality of tack coat applied. To identify quality of tack coat before overlay is placed on top of it, a device "UTEP Pull-off Device (UPOD)" that measures quality of tack coat has been developed. The device can be placed on top of the tack coat layer after specified interval and quality of tack coat is evaluated based on the magnitude of cohesive strength. The developed device is simple, reliable, economical, and could determine the quality of the tack coat in less than 45 minutes after application of tack coat.; Although UPOD can measure the quality of tack coat, a field acceptance criterion has not been established and is the objective of this research. To develop the criterion, the field tests were performed with the help of TxDOT. Based on the laboratory and field test results, an acceptance criterion has been proposed... |
