Performance engineered concrete mixtures (PEM) include optimized mixture designs and advanced quality assurance methods to provide improved economy, durability, and sustainability of concrete mixtures. The North Carolina Department of Transportation (NCDOT) has supported several research studies to support collection of data for targeted PEM testing technologies and some prescriptive measures. Through these studies, performance targets and proposed specification provisions have been developed for surface resistivity, super air meter (SAM), and shrinkage.
In 2018, NCDOT applied for funds to support PEM implementation as part of FHWA’s “Demonstration Project for Implementation of Performance Engineered Mixtures/AASHTO PP 84.” Funding to support three categories of implementation were secured.
This report details the efforts associated with these implementation funds, which included
(1) use of PEM tests for QC and acceptance (shadow purposes only) at a concrete paving project,
(2) analysis of data from the PEM implementation project and integration of this data with that obtained from other laboratory studies supporting the PEM initiative,
(3) development of technology transfer documents (test procedures for PEM tests compatible with NCDOT’s Concrete Field Technician Study Guide),
(4) development and delivery of a seminar/workshop to support technology transfer to NCDOT’s division and region personnel, and
(5) preparation of the final report of the PEM implementation project to fulfill the required deliverable to FHWA.
Data and findings from the implementation site supported specification recommendations made by UNC Charlotte as part of PEM research, and informed additional shadow testing at an implementation project focused on structural concrete.
A final report was prepared and submitted to FHWA to fulfill requirements of receipt of PEM Implementation Funds, and a number of additional presentations were made to publicize NCDOT’s PEM efforts. Technology transfer tools produced and disseminated as part of this work will provide continued opportunities to educate NCDOT personnel at the divisional and regional levels, as well as other stakeholders, about the PEM initiative and provide training on the PEM tools targeted for use by NCDOT.
Advancements made through NCDOT’s PEM efforts will impact specifications, design, and construction. More durable, sustainable concrete mixtures will be specified and used in North Carolina highway infrastructure, resulting in cost savings for construction, quality assurance, and extended life of concrete pavements and bridges.
