July 2018 In association with the CP Road Map Program
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. For the July 2018 E-News, please click on image to left, on any news below, or go to: July E-News: http://www.cproadmap.org/publications/e-news_Jul2018.cfm#MAP
Moving Advancements into Practice (MAP) Brief describes promising research and technologies that can be used now to enhance concrete paving practices. The July 2018 MAP Brief, “Using RCA in Pavement Base Products”, provides a summary of constructibility considerations, qualification testing, and pavement design considerations for both unbound and bound (stabilized) RCA base applications. For a PDF of the 8-page JULY 2018 MAP Brief, please click on image to the left, or go to: http://www.cproadmap.org/publications/MAPbriefJul2018.pdf
Videos on Concrete Pavements
Dr. Tyler Ley, Professor of Civil and Environmental Engineering at Oklahoma State University, has developed a series of videos on the Tarantula Curve. The link below includes his latest video as well as access to five other more detailed videos on the same subject: https://youtu.be/V-r4-9OcuyY. (The five other video links can be found below this video as well). ISCP posted an article this month titled “New Website, Videos, Paper: Tarantula Curve—Mix Designs & Enhancing Aggregates” that will direct readers to all 6 videos as well.
NCC State Survey Summaries
Member states of the National Concrete Consortium (NCC) have the ability to poll other member states regarding specifications, materials, construction, research, or other issues related to concrete paving. This section highlights some of the questions posed and answers received through the NCC’s ListServ feature.
The Missouri Department of Transportation (MoDOT) polled the NCC group regarding the use of base type and thickness for portland cement concrete (PCC) pavements (shown here) and hot-mix asphalt (HMA) pavements (not shown here). Sixteen agencies responded for Interstate and non-Interstate highways. Because of the variability in different bases for Interstate highways, the following data show only non-Interstate. A majority (7) of the agencies responded that they typically use 4-in. to 6-in. aggregate bases for non-Interstate highways. Under the “other” category in the pie chart, two states are covered. Illinois DOT listed its base as 4 in. HMA or PCC stabilized base and Michigan listed its base as 6 in. open graded over 10 in. sand.
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. The research projects and the summaries described herein are the products of the researchers and sponsors.
Updating Physical and Chemical Characteristics of Fly Ash for Use in Concrete (December 2017)
This research was an attempt to quantify the effects of fly ashes on the properties of pastes as a function of (a) the mean particle size of the fly ash particles, (b) their fineness, and (c) their chemical composition. In addition, since the type and the amount of glass present in the fly ash significantly affect its reactivity, this property was also included in the investigation. Twenty different fly ashes (both, ASTM Class C and Class F), obtained from power plants in and around Indiana, were characterized during Phase 1 of the study. To read this article, please go to: http://www.cproadmap.org/publications/e-news_Jul2018.cfm#MAP
Use of Lightweight Sand for Internal Curing to Improve Performance of Concrete Infrastructure (March 2018)
The goal of this project was to develop an effective methodology to use saturated lightweight sand (LWS) for internal curing to enhance concrete performance and prolong service life of concrete structures. High-performance concrete (HPC) mixtures approved by MoDOT for pavement and bridge deck structures were used for the baseline mixtures. Five different types of saturated LWS employed at various contents were investigated to evaluate the optimum dosage of LWS and maximize its effectiveness on enhancing concrete performance. Performance improvement from the LWS focused mainly on reducing autogenous and drying shrinkage and the resulting cracking potential without sacrificing durability and cost competence. To read this article, please go to: http://www.cproadmap.org/publications/e-news_Jul2018.cfm#MAP
Central Iowa Expo Pavement Test Sections: Pavement and Foundation Construction Testing and Performance Monitoring (February 2018)
The Central Iowa Expo facility located in Boone, Iowa, needed to be reconstructed in 2012 to provide an improved pavement foundation for portland cement concrete (PCC) and pavement with hot-mix asphalt (HMA). This rework created a unique opportunity to conduct pavement foundation research using a range of stabilization construction and testing technologies on about 4.8 miles of roadway. The Iowa Department of Transportation (IDOT) initiated a research project to build the pavement foundation layer (Phase I), construction of the pavement layers (Phase II), and performance monitoring of the pavement systems (Phase III). To read this article, please go to: http://www.cproadmap.org/publications/e-news_Jul2018.cfm#MAP
Evaluation of MIT-SCAN-T2 for Thickness Quality Control for PCC and HMA Pavements (February 2018)
Thickness is currently a pay item for PCC pavements and a quality control item for both PCC and HMA pavements. A change in pavement thickness of 0.5 in. can result in a change of multiple years of service. Current thickness measurements are performed by destructively coring the finished pavement and measuring the thickness of the core.
A project from the Missouri University of Science and Technology-Rolla studied the design and performance of cost-effective ultra-high performance concrete (UHPC) for bonded bridge deck overlays. To read this article, please go to: http://www.cproadmap.org/publications/e-news_Jul2018.cfm#MAP
Design and Performance of Cost-Effective Ultra High-Performance Concrete for Bridge Deck Overlays (report date: October 2017) This is the last of a series of three research reports on Ultra-High Performance Concrete on Bridge decks. The April 2018 E-News contains research reports on 1. Development of Nonproprietary Ultra-High Performance Concrete and 2. Field Testing of a Ultrahigh Performance Concrete Overlay on Bridge Decks. The main objective of this #3 research report is to cover the design and performance of cost-effective ultra-high performance concrete (UHPC) for bonded bridge deck overlays.
For more information and to learn how to participate with NCC and the CP Road Map, contact:
Dale Harrington: E-mail: dharrington@hceservices.com | P: 515-964-2020
E-News Homepage: https://cptechcenter.us10.list-manage.com/track/click?u=4bf55bc365dca0e5c928442da&id=af075cb108&e=2945805a7f