2007 – NZ - Benchmarking Pavement Performance between Transit’s LTPP and CAPTIF Programmes

This research project is the second report detailing findings from the NZ Long Term Pavement Performance (LTPP) programme. This programme includes the monitoring of 63 sections on the State Highways and 82 sections on local authority roads. This report details all work related to developing a rutting model for New Zealand conditions. Previous work highlighted some data limitations in the LTTP programme – some of this development work relied on the Transit CAPTIF accelerated pavement testing programme.

This research project also investigated a total new method of predicting rut changes over time including:

• a simplified model proposed for the initial rut/initial densification of the pavement;

• model formats considered for the prediction of the annual change in rutting progression; and

• an additional component to the rutting model added to predict the probable point when the accelerated rut stage starts.