01472664

Component

Statistical specifications for highway construction provide the means to measure the important quality control attributes and ensure their compliance. The pay adjustments, part of these specifications, reflect the amount of deduction or bonus and the optimized risk distributed between the owner and the contractor. The Kansas Department of Transportation (KDOT) has built a comprehensive database of as-constructed material properties for Superpave pavements from the tests required in the Quality Control/Quality Assurance (QC/QA) program. Currently, KDOT pays incentives/disincentives for mixture air voids and in-place density of Superpave pavements. A practical performance model and composite index that included air voids, in-place density, asphalt content, and voids in mineral aggregate have been developed from an analysis of KDOT Superpave mixture QC/QA database to fully account for the factors that affect the performance of Superpave pavements. In this study, the practical performance, composite index, and pay adjustment models were verified. Two superpave mixes with 25% Reclaimed Asphalt Pavement (RAP) were compacted using gyratory compactor at different asphalt contents. The corresponding volumetric properties were computed. Percent within limits (PWLs) were calculated for all quality characteristics. Expected life, composite index, and pay adjustment values calculated from the previously developed models based on PWLs for the different quality characteristics show the reasonableness of the models. The expected life model developed with air voids, VMA, asphalt content, and in-place density predicted expected life from a maximum of 11.4 years for good quality and an expected life of 2.6 years for poor quality for pavements with a 12.5 mm Nominal Maximum Aggregate Size Superpave mixture. It is believed that the models will be more robust when more Superpave mixes (coarse mixes and mixes without RAP) are used and then correlated with actual field data.

This paper was sponsored by TRB committee AFH20 Management of Quality Assurance.

01470560

13-0668

English

16p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; References; Tables

Air voids; Asphalt content; Asphalt mixtures; Mathematical models; Pavement performance; Performance based specifications; Quality assurance; Quality control; Superpave

Construction; Highways; Pavements; I52: Construction of Pavements and Surfacings

Transportation Research Board Annual Meeting 2013 Paper #13-0668

TRIS, TRB, ATRI

Feb 5 2013 12:15PM