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From page 14...
... 14 CHAPTER 4. CONCLUSIONS AND RECOMMENDATIONS 4.1 CONCLUSIONS This study was conducted to prepare precision estimates for AASHTO Standard Test Method T269, "Percent air Voids in Compacted Dense and Open Asphalt Mixtures".
From page 15...
... 15 4.2 RECOMMENDATIONS The following recommendations are expected to improve the precision estimates of AASHTO T 269: The current precision of T 269 test method depends on the precision of test methods for bulk specific and maximum specific gravities. It was shown in this study that the specific gravities that are measured to be within acceptable range of two results might result in air void values that fall outside of the acceptable range.

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