Asphalt oils evaporate, and causes separation of the asphalt from the aggregate. Whether applied by a hand-held torch or large machine, heating pavement changes the inherent characteristics of the pavement. It frequently produces a burned or scaled surface, and a weaker pavement material. Infrared rays avoid these damages by producing heat deep within the surface material. The rays penetrate the materials, softening it without significantly changing its characteristics.
Infrared machines are of two types, one for repair and a second for reclaiming pavement material.
Position infrared panel over area to be repaired and allow heat to pentrate 5-9 minutes depending on depth, season, and aggregate. Add material if necessary to bring patch to grade and lute to level. Compact with vibratory roller or plate compactor. Apply sealers if called for. Infrared rays initially penetrate only to the next compacted layer.