What is the maximum temperature variation allowed for GMM water?

The maximum temperature variation allowed for GMM (Gauge Measured Moisture) water is set at ±2°F. This limit is critical during the asphalt production process because maintaining precise temperature control is essential for achieving the desired performance characteristics of the asphalt mix. If the water temperature deviates too much from the specified range, it can impact the viscosity of the asphalt binder, moisture content in the mix, and overall consistency, which may lead to issues such as segregation, poor compaction, or even premature failure of the pavement.

Adhering to this tolerance ensures that the asphalt mix maintains its integrity and performance over its lifespan. By keeping water temperatures within ±2°F, operators can ensure that the hydration and mixing processes occur efficiently, which directly influences the quality of the end product.

The other temperature variations provided in the options exceed this standard, which would not be compliant with the best practices and specifications recommended for asphalt production.