How is asphalt temperature typically measured during paving?

Asphalt temperature during paving is typically measured using an infrared thermometer. This tool measures the surface temperature of the asphalt without needing direct contact, which is vital since asphalt is often very hot and can cause burns. Infrared thermometers work by detecting the infrared energy emitted by the asphalt, allowing for quick and accurate temperature readings.

This method is preferred over other options because it provides immediate feedback on the temperature of the asphalt, which is crucial for ensuring it is at the proper working temperature for optimal compaction and application. Proper temperature is necessary because it affects the viscosity of the asphalt, which in turn influences how well the material can be manipulated during paving and ultimately affects the longevity and performance of the roadway.

In contrast, a barometer is used for measuring atmospheric pressure, while a standard thermometer typically requires contact with the substance being measured - which could be problematic with hot asphalt. A pyrometer is generally used for high-temperature applications and may not be as commonly employed in standard paving operations compared to an infrared thermometer.