What is the temperature of the water used in GMM and GMB testing?

The correct choice indicates that the temperature of the water used in GMM (Specific Gravity of the Mineral Matter) and GMB (Specific Gravity of the Binder) testing is set at 77 degrees Fahrenheit, with an allowable variation of plus or minus 2 degrees.

This specific temperature range is critical because water temperature can significantly influence the results of specific gravity tests. Maintaining a consistent temperature ensures that the tests are reproducible and that they produce accurate results, which is essential for quality control in asphalt mixture design and performance. The variation of plus or minus 2 degrees is tight enough to limit discrepancies caused by temperature fluctuations, ensuring that the testing conditions remain standardized.

Understanding the correct temperature range and its importance in testing processes helps in achieving reliable data, which ultimately affects decisions on material usage and pavement performance in the field.