What is the purpose of chip sealing in pavement maintenance?

Chip sealing serves the primary purpose of prolonging the life of existing pavement while simultaneously improving its surface condition. This maintenance technique involves applying a thin layer of asphalt binder followed by a cover of aggregate chips, which helps to seal cracks and create a waterproof surface, thus preventing moisture infiltration that could lead to further deterioration.

By enhancing surface traction and reducing the effects of weathering, chip sealing effectively extends the functional lifespan of the pavement. This cost-effective method is particularly valuable for managing existing roads that may exhibit signs of wear and tear, rather than needing complete replacement.

Other options do not accurately reflect the intent of chip sealing. For instance, creating an entirely new pavement surface would involve processes like full-depth paving, which is not what chip sealing addresses. Similarly, while chip sealing can help reduce some crack propagation, it does not involve the comprehensive repair of all cracks in the pavement. Lastly, while improved drainage can be a secondary benefit from the stabilization of the surface, it is not the primary purpose of chip sealing. The main focus is on maintenance and enhancement of the existing pavement's condition.