The National Concrete Consortium (NCC) E-News is the newsletter of the Long-Term Plan for Concrete Pavement Research and Technology (CP Road Map), a national research plan developed and jointly implemented by the concrete pavement stakeholder community.
Moving Advancements into Practice (MAP) Brief describes promising research and technologies that can be used now to enhance concrete paving practices. The April 2018 MAP brief, “Concrete Overlay Performance on Iowa’s Roadways – 2017″, provides a summary of the research completed in July 2017 on the performance of concrete overlays in Iowa. Approximately 1,500 miles of concrete overlays constructed over the last 40 years in Iowa were reviewed for performance using Pavement Condition Index (PCI) and International Roughness Index (IRI). For a PDF of the APRIL 2018 MAP Brief, please click on image to the left, or go to: http://www.cproadmap.org/publications/MAPbriefApr2018.pdf
NEWS FROM THE ROAD highlights research around the country that is helping the concrete pavement community meet the research objectives outlined in the CP Road Map. For the full news reports below, please go to: http://www.cproadmap.org/publications/e-news_Apr2018.cfm#MAP
Development of Non-Proprietary Ultra High Performance Concrete: Researchers at Montana State University’s Western Transportation Institute completed a study to develop and characterize economical non-proprietary UHPC mixes made with materials readily available in Montana. Ultra High Performance Concrete (UHPC) has mechanical and durability properties that far exceed those of conventional concrete. The overall objective of this research was to develop and characterize economical non-proprietary UHPC mixes made with materials readily available in Montana … read on
Field Testing of an Ultra-High Performance Concrete Overlay on Bridge Decks: Bridge decks are commonly rehabilitated using overlays, depending on the cause of deck deterioration, available budget, and desired service life of the rehabilitated structure. One emerging solution for bridge deck rehabilitation is thin, bonded, ultra-high performance concrete (UHPC) overlays. The FHWA Office of Infrastructure Research & Development sponsored a field study to evaluate the bond between a UHPC overlay and a substrate concrete bridge deck on a bridge in Brandon, Iowa … read on
Low Cracking Concretes for the Closure Pours and Overlays of the Dunlap Creek Bridge: Joints, wide cracks, and poor-quality concretes facilitate the intrusion of chlorides, causing corrosion in bridge decks and substructures. In this study, two parallel bridges located on Route 64 over Dunlap Creek in Alleghany County, Virginia, each with five simple spans, were selected for study by the Virginia Department of Transportation (VDOT), in cooperation with FHWA … read on
Case Study Report on Full-Depth Repair: Full-depth repair (FDR) is a well-established technique applied to existing jointed plain and jointed reinforced concrete pavements (JPCP and JRCP) that includes both partial slab replacement and full slab replacement to address any variety of serious distress. FDR provides for the long-term repair of structurally and/or functionally deteriorated joints, working cracks, shattered slabs, and multiple slab distress. When combined with other needed concrete pavement restoration (CPR) techniques, FDR can significantly increase pavement service life before structural overlay or reconstruction is required. FDR can also increase the life of a pavement to be overlaid by providing high joint load transfer efficiency (LTE) to restore stability and control reflection cracking severity. The Missouri Department of Transportation, in conjunction with FHWA, published a case study report that focuses on full depth repair in California for JPCP and in Missouri for JRCP and includes information from Georgia, Minnesota, Utah, and Washington … read on
Concrete Strength Required to Open to Traffic: The current empirical methods for determining traffic-opening criteria can be overly conservative, causing unnecessary construction delays and user costs. The research described here recommends innovative mechanistic-based procedures for monitoring concrete early-age development and evaluating the effect of early traffic opening on long-term damage accumulation. The procedure utilizes recent developments in nondestructive testing to optimize traffic opening timing without jeopardizing pavement longevity. These tasks were achieved via extensive field and laboratory experiments, allowing for the analysis of variables such as curing condition and loading type with respect to the effect of early loading of concrete.
The Minnesota Department of Transportation published a report recommending innovative mechanistic-based procedures for monitoring concrete early-age development and evaluating the effect of early traffic opening on long-term damage accumulation … read on
To read the April E-News, click on the link following each article highlighted below, on the image to the right, or go to: http://www.cproadmap.org/publications/e-news_Apr2018.cfm
If you’d like to find out more about the CP Road Map or learn how you can get involved, contact:
Jerod Gross, Program Manager:
E-mail: jgross@snyder-associates.com | P: 515-964-2020
Steve Klocke: E-mail: sklocke@snyder-associates.com
Dale Harrington: E-mail: dharrington@hceservices.com | P: 515-964-2020
For the E-News Archive, please go to: http://www.cproadmap.org/publications/e-news_archive.cfm