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The AASHTO Accreditation Program (AAP) was established in 1988 to provide a mechanism for formally recognizing the competency of testing laboratories to perform specific tests on construction materials. Some of you who know the history of the industry may be surprised that the AAP is so young because the AASHTO re:source and CCRL (Cement and Concrete Reference Laboratory) have been around much longer. In fact, the AASHTO re:source was founded in 1965 and the CCRL was established in 1929, as the Cement Reference Laboratory (CRL). The AASHTO re:source and CCRL are collectively known as the Construction Materials Reference Laboratories (CMRL).

Over the course of time I'll explore metrology topics such as calibration, traceability, uncertainty, and measurement standards. As we investigate and unravel some of these metrology mysteries we will determine what makes a good measurement - one that we can trust. We will think together and learn which questions to ask about our measurements. However, with this inaugural article about metrology, I'll keep it simple and fun by providing some interesting facts about metrology history.

Thousands of laboratories in over 30 countries around the world participate in the AASHTO re:source Proficiency Sample Program (PSP). However, many of us never stop to think about the time, manpower, and logistics needed to produce and distribute these high-quality test samples. This article is intended to provide a better understanding of the complex process involved in proficiency sample production and analysis.

These are exciting times in the world of thermometry. Due to the efforts of the Interstate Mercury Education and Reduction Clearing House (IMERC), the way that we take temperature measurements is almost certainly going to change. The initiative has prompted states across the country to reduce the use of mercury and products containing mercury. As concerns over the use of mercury continue to grow, this trend is expected to continue. Several commonly used AASHTO and ASTM standards still require the use of liquid-in-glass thermometers for testing. The recent developments in mercury regulation have caused quite a stir in the construction materials testing community.