Why should screeds be heated prior to use?

• A. Overheating can warp the screed plate.
• B. To cool the mix rapidly after placement.
• C. They should be heated only in cold weather.
• D. Screeds need to be heated to the temperature of the mixture prior to use to prevent sticking and minimize pulling and tearing.

Answer: (D)

Heating the screed to the asphalt mix temperature ensures the plate and the material being laid are at similar temperatures. When the screed is cooler than the hot mix, the asphalt tends to stick to the screed plate as you pull the screed along, which can pull or tear the fresh mat and create ridges or rough edges. By bringing the screed up to the mix temperature, adhesion is reduced, the screed can slide smoothly, and the final finish is cleaner with less pulling and tearing. Keep in mind that excessive heat can warp the screed plate, so use the recommended temperature range rather than overheating.