What is a limitation of screed heaters during asphalt paving?

Screed heaters are employed during asphalt paving to help maintain the temperature of the asphalt mixture as it is laid down. A fundamental limitation of screed heaters is that they do not have the capability to raise the temperature of the mix; their role is primarily to prevent heat loss and maintain the temperature of asphalt that has already been produced and transported to the paving site.

During the paving process, if the asphalt mix cools too much, it can lead to poor compaction and compromised pavement quality. However, if the mix has already cooled below the necessary temperature for optimal placement, screed heaters alone will not be able to elevate the temperature of the aggregate. Their function is to sustain the mix's existing warmth rather than to heat it up anew. This understanding is critical for ensuring proper workmanship and quality in asphalt paving operations.

Additionally, the other options reflect either capabilities that are not directly related to screed heaters or operations that may be more influenced by other equipment or factors during the paving process.