Asphalt used for road surfacing, parking lots etc., is manufactured in a two-stage process where crushed stone and sometimes crushed, recycled glass is mixed with tar and other binders. First, the crushed material is dried and preheated in a continuous, rotary, horizontal furnace. It is then conveyed to a mixer where the binders are added, and the mix is further heated. The source of heat in both cases is a single, gas or oil-fired burner. When the temperature is correct, the mix is dumped into a truck and taken to the laying sight.
Thermocouples are used to measure and control the temperature in the dryer and mixer but are relativly insensitive to rapid temperature changes and require frequent replacement. IR Thermometers are more responsive to process temperature changes, and do not need to be in contact with the abrasive material
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