What materials must be removed from the edge of existing pavement prior to placement of tack coat?

The correct answer indicates that grass, dirt, and other materials must be removed from the edge of existing pavement prior to the placement of tack coat. This is essential because the effectiveness of the tack coat relies on its ability to bond to a clean surface. Any contaminants, such as grass, dirt, or debris, can interfere with this bonding process and may result in a weakened connection between the existing pavement and the new asphalt layer.

By ensuring that the surface is free of these materials, you are setting the foundation for a strong and durable pavement joint. It is critical in roadway construction and maintenance to adhere to these cleaning protocols to extend the lifespan of the asphalt surface and prevent issues like delamination or failure of the new layer. This practice plays a significant role in ensuring the overall quality and integrity of the roadway.