The new Mechanistic-Empirical Pavement Design Guide (MEPDG) requires the coefficient of thermal expansion (CTE) of concrete materials as a direct input to determine critical pavement distresses. Since equipment for measuring CTE was not available for commercial procurement at the time of this study, an automated device was developed in this study in accordance with AASHTO TP 60. The device is easy to use and provide sufficient data for design applications. Preliminary precision statements of the AASHTO TP 60 protocol using the developed measuring device were established for use at this moment, and they would be refined when additional CTE data become available. Further analyses of CTE data found that the type of coarse aggregates used for a mixture significantly influenced both the CTE values and pavement performance predictions. While the effect of nominal maximum aggregate size on the CTE and predicted pavement performance was not significant in this study, further evaluation of this effect should be done because of limited nominal maximum aggregate sizes used in this study.