Validation of the Coredry(Tm) and Corereader(Tm) Appratus

Abstract

The evaluation of CoreDry�, and CoreReader� apparatus was based on the test results of laboratory prepared ODOT S3, S4 and SMA mixes and field cores of 100 mm and 150 mm. The CoreDry� apparatus was evaluated by comparing the dry mass obtained using the CoreDry� apparatus with dry mass obtained by AASHTO T166 drying methods. The evaluation of CoreReader� was completed by comparing the Gmb obtained using CoreReader� apparatus and Gmb obtained by AASHTO T166 procedures. The comparison of means of dry masses and Gmbs was performed by statistical tests such as ANOVA, paired t-test, and t-test.The CoreDry� apparatus can be used for the drying of lab compacted as well as field core samples for the Gmb determination. CoreReader� apparatus did not produce similar results to AASHTO T166. If desire to use, correlations should be developed similar to those used when using the field nuclear density devices. It is necessary to saw the field core samples to make its faces smooth and parallel for the Gmb determination by CoreReader� apparatus.