Forensic Investigation of Early Racking on I-25 in Denver, Colorado

摘要

In May 2000 CDOT requested a forensic evaluation of a project located on I-25north of Denver. Within a year of the 1997 overlay, longitudinal cracking appeared in the surface. Two years later the pavement appeared to be deteriorating rapidly. In October 2000, a forensic team of pavement exports received the project and established a sampling and testing plan. Based on the data analysis, it was the opinion of the forensic team that the early cracking of I-25 was caused by several 'factors, which were combined on this project. The factors included; Higher in-place air voids than expected and Low effective asphalt and Segregation within the mat. The forensic team also provided recommendations to minimizing occurrences of similar behavior on future projects.