Material Characterization Plan & Data

Acceptance of the CC3 subgrade construction was based on four CBR measurements in each wheel track over 300 feet (91.4 m) of constructed subgrade. Each CBR measurement consisted of three penetrations within a circle of approximately 1-foot (0.3 m) radius. The CC3 subgrade was built up in four equal lifts to the finished grades simultaneously over the full 300 feet (91.4 m). The starting grade of the newly constructed subgrade was also reworked to the target strength, giving five effective newly constructed lifts.

Acceptance CBRs of the final lift of the CC3 subgrade were 3.16 for the north lane and 3.17 for the south lane, each number being the average of four CBR measurements. The range of the measurements was 0.9 in the north lane and 1.3 in the south lane. The measurements were made with one measurement in each of the four test items for each traffic lane. The following table summarizes the subgrade acceptance test results. The table includes acceptance CBR values with their corresponding moisture content. Additional data regarding the material characterization for each pavement construction lift can be downloaded here.

Samples were taken from the various pavement layers for laboratory testing.  These tests were specified in order to characterize the materials comprising the pavement layers and were separate from the acceptance tests. 

TABLE 1. LABORATORY TESTS PERFORMED ON PAVEMENT LAYERS