FACTORS AFFECTING PERFORMANCE OF CONCRETE PAVEMENTS

This article examines the various factors influencing the performance of concrete pavements, drawing primarily from experiences in Florida. The discussion begins with the observation that concrete pavements which do not exhibit distress within the first few years typically perform well throughout their intended lifespan. This generalization is explored through an examination of Florida's jointed concrete pavements, which range in age and exhibit varying degrees of performance. The research suggests that pavement distress often arises from a combination of factors rather than fatigue failure alone. Key areas of focus include the effects of temperature-induced displacements on slab warping and curling, and the consequent impact on pavement distress. The study details the role of initial slab warping during construction and its permanent deformation, further complicated by daily temperature cycles. It also addresses the significant issue of water intrusion through joints and its damaging effects, such as pumping and joint faulting, which compromise pavement integrity. The investigation extends to pavement design considerations, emphasizing the importance of doweled joints, slab geometry, and base stiffness in mitigating distress. Additionally, the composition of the concrete mixture, particularly the use of high early strength concrete, is scrutinized for its tendency to induce microcracks, leading to premature pavement failure. The article concludes with recommendations for improving pavement performance, including considerations for design, mixture composition, and construction practices, underlining the necessity for a multifaceted approach to address the complex nature of concrete pavement performance. (Abstract generated by AI tool ChatGPT 4)