Quantifying Segregation in HMA Pavements Using Non-Nuclear Density Devices: Data Collection Report for Connecticut

摘要

This ConnDOT project complements the National Pooled Fund Study, SPR-3 (082), Phase II. Phase II was to develop a method to quantify the level of volume segregation in HMA pavements using density profiles obtained from non-nuclear (electromagnetic) density gauges. The purpose of the ConnDOT project was to collect field density data on newly placed HMA pavements for submittal to the Pooled Fund contractor (University of Utah) and to evaluate the ability of two non-nuclear devices to collect data for determining severity of pavement segregation in Connecticut. Two locations were used for the evaluation: I-84 Waterbury and Route 66, Middlefield, CT. Density measurements were made within a pre-defined grid, using the two devices (and a nuclear density gauge at one of the sites (Route 66)). Cores were cut and removed from areas thought to represent low, medium and high density areas within the grids, as determined by the various gauges. The cores were sent to the University of Utah for analysis of gradation, air voids and asphalt content. The results indicate that the density variations measured with the non-nuclear devices were not very useful for determining volume segregation or uniformity at these two project sites.