In a concerted effort to improve the durability and long-term performance of pavements on state highways, the Performance Engineered Concrete Paving Mixtures Transportation Pooled Fund (TPF-5(368)) has introduced groundbreaking tests and technologies. These innovations, aimed at measuring engineering properties more closely aligned with a pavement’s field performance, mark a significant departure from traditional approaches. Rather than solely focusing on metrics like strength and slump, the new methods emphasize performance-related criteria such as transport properties, shrinkage, freeze-thaw resistance, and workability.
To facilitate the adoption of these performance-engineered mixtures (PEM) concepts, the Federal Highway Administration (FHWA) has offered incentive funding to state agencies. This funding aims to assist agencies in conducting additional shadow testing, data collection, and reporting, thereby encouraging the transition towards more advanced testing methods. Seven out of the 19 pooled-fund states have accepted this incentive funding, with results from six states showcased in subsequent sections of the circular.
While implementing PEM concepts, the majority of state agencies have acknowledged the benefits, albeit with variations in experiences across different states. To further promote understanding and adoption, four of the six states organized open houses. These events provided an opportunity for agencies and industry stakeholders to engage in discussions about PEM requirements and to gain exposure to the testing methods. The Mobile Concrete Technology Center (MCTC) played a pivotal role in showcasing PEM testing during these events, offering hands-on demonstrations and discussions.
Highlights from the six states’ PEM pilot projects underscore the tangible benefits of this approach. From enhanced durability to improved performance in adverse conditions, the results speak to the efficacy of performance-driven testing methods. As state agencies continue to refine and adapt these approaches to their local conditions and contracting environments, the potential for long-lasting, resilient pavements on state highways becomes increasingly promising. With ongoing support and collaboration, the advancements in concrete paving mixtures testing are poised to revolutionize infrastructure durability and performance nationwide.
Read more about State experiences here: https://onlinepubs.trb.org/onlinepubs/circulars/ec287.pdf