What is the purpose of extending tack past the full paving width?

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Multiple Choice

What is the purpose of extending tack past the full paving width?

Extending the tack beyond the full paving width focuses on edge stability and bonding during compaction. The tack coat provides an adhesive film that helps the new asphalt stick to the existing pavement and to the adjacent edge. When you extend that tack film past the edge, the edges remain coated and bonded as rolling and compaction occur, which reduces edge movement, feathering, and the potential for a weak or pulled‑out edge at the joint. This leads to a tighter, more uniform edge and a better overall bond between lifts. It’s not about avoiding tack at the edge, creating a larger joint gap, or speeding up tack curing time—the goal is to keep the edge from moving during compaction to produce a durable joint.

Extending the tack beyond the full paving width focuses on edge stability and bonding during compaction. The tack coat provides an adhesive film that helps the new asphalt stick to the existing pavement and to the adjacent edge. When you extend that tack film past the edge, the edges remain coated and bonded as rolling and compaction occur, which reduces edge movement, feathering, and the potential for a weak or pulled‑out edge at the joint. This leads to a tighter, more uniform edge and a better overall bond between lifts. It’s not about avoiding tack at the edge, creating a larger joint gap, or speeding up tack curing time—the goal is to keep the edge from moving during compaction to produce a durable joint.

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