Optimized Design Details for Continuously Reinforced Concrete Pavements

Abstract

Continuously reinforced concrete pavement (CRCP) is widely used by several highway agencies in the United States, typically for heavily-trafficked roadways. CRCP has the potential to provide long-term "zero-maintenance" service life under heavy traffic loadings and challenging environmental conditions, provided that proper design and quality construction practices are utilized. CRCP design focuses on managing the cracking that develops so as to reduce the structural distresses that may develop as a result of traffic and environmental loadings. These distresses include punchouts, steel rupture, and crack spalling. CRCP design involves determining the proper combination of slab thickness, concrete mixture constituents and properties, and steel reinforcement content and location; providing for sufficient slab-edge support; strengthening or treating the existing soils; and providing non-erodible bases that also provide friction, which leads to desirable transverse cracking patterns. In addition, CRCP design details must ensure that the large movement that can occur at CRCP terminal ends is managed adequately. Over the years, many improvements in the best practices in the design of CRCP have been implemented to improve long-term performance. These improvements have resulted from experience from the field, better understanding of CRCP behavior, improved structural modeling of CRCP, improved materials, and improved construction processes. This paper provides guidance on optimizing several key design features based on the information included in the previously cited references and recent refinements implemented in the field. These key design features include: optimizing longitudinal steel content, simplified details for terminal ends, improved transverse construction joint detail, shoulder type, and concrete slab/base interface.