Pavement maintenance is crucial for the longevity and functionality of any surface, whether it’s a driveway, parking lot, or road. Over time, wear and tear can lead to structural issues that require attention. One of the most critical aspects of pavement health is the subgrade, the foundation that supports the pavement layers. Here are three signs that your pavement may need subgrade recompacting. 

Cracks and Potholes 

Types of Cracks 

Cracks are one of the most obvious signs that there may be underlying issues with the subgrade. There are several types of cracks, including: 

• Alligator Cracks: These resemble the scales of an alligator and indicate a severe subgrade failure. 

• Longitudinal Cracks: These run parallel to the pavement’s centerline and often point to issues with the underlying support. 

• Transverse Cracks: These are perpendicular to the centerline and can be caused by the contraction and expansion of the pavement. 

Causes and Implications 

Cracks often form due to heavy traffic loads, environmental conditions, or poor initial construction. When cracks appear, water can seep through, weakening the subgrade and leading to further deterioration. Potholes form when these cracks expand and the subgrade erodes, creating voids under the pavement. 

Uneven Surfaces and Depressions 

Identifying Uneven Pavement 

Uneven pavement surfaces, or depressions, are another clear indicator of subgrade issues. These can be identified by: 

• Pooling Water: After rain, water collects in low spots instead of draining properly. 

• Visual Depressions: Areas where the pavement looks sunken or deformed. 

• Uneven Wear: Noticeable differences in pavement wear patterns. 

Consequences of Uneven Surfaces 

Uneven surfaces not only pose safety risks for vehicles and pedestrians but also suggest that the subgrade has shifted or settled unevenly. This can be due to inadequate initial compaction, poor drainage, or the presence of expansive soils that swell and shrink with moisture changes. 

Rutting and Shoving 

What is Rutting? 

Rutting refers to the formation of grooves or channels in the wheel paths of the pavement. It occurs when the pavement layers, including the subgrade, cannot support the repeated loads of traffic. 

What is Shoving? 

Shoving, on the other hand, is a form of pavement deformation where the surface material is displaced, creating an uneven, wave-like appearance. This often occurs at intersections or areas with frequent braking and acceleration. 

Impact on Pavement Integrity 

Both rutting and shoving compromise the smoothness and safety of the pavement. They indicate that the subgrade is failing to provide adequate support, leading to permanent deformation. This is often a result of poor initial construction practices or inadequate material quality. 

Trust Preferred Paving 

Maintaining the integrity of your pavement is essential for safety and longevity. Cracks, uneven surfaces, and deformation are clear signs that your pavement’s subgrade may need recompacting. Addressing these issues promptly can prevent further damage and extend the life of your pavement. 

Preferred Paving Company, Inc. has been paving Southern California since 1986, offering a complete range of asphalt and concrete services. With our extensive experience in new paving and repair work, we ensure that your pavement is not only functional but also durable. Our team of experts uses the latest techniques and high-quality materials to deliver exceptional results. Trust Preferred Paving for all your paving needs and experience the difference that professional, dedicated service can make. Contact us today to learn more about how we can help maintain and improve your pavement infrastructure.