FC-5 is primarily associated with which aspect of shoulder construction?

FC-5 is primarily associated with joint spacing in shoulder construction. Proper joint spacing is critical to ensuring that the shoulder can accommodate expansion and contraction due to temperature changes and load stresses without developing cracks or other forms of distress. This aspect is particularly important in maintaining the integrity of the pavement structure and ensuring its longevity.

Understanding joint spacing in relation to shoulder construction helps in effective water drainage, which is essential in preventing erosion or damage. Moreover, correct spacing allows for proper load distribution, which is vital in reducing the risk of structural failures over time. While aspects like thickness specifications, aggregate type requirements, and asphalt binder usage are important in paving, they do not specifically address the unique concerns associated with joint spacing which focus on movement and structural stability.