PMSS Project Details

Project ID:	FHWA-PROJ-10-0062
Project Name:	Deleterious Aggregates—Identification, Testing, Mitigation, Use of Local Materials
Status:	Active
Contact:	Last Name: Meininger First Name: Richard C (Rick) Telephone: 202-493-3191 E-mail: richard.meininger@dot.gov
Organization:	Federal Highway Administration - Turner-Fairbank Highway Research Center (TFHRC)
Office:	Office of Infrastructure Research and Development
Team:	Pavement Materials Team
Roadmap/Focus area(s):	Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:	The goal is to mitigate the water sensitivity of mixes using these materials. In hot-mix asphalt, the use of phosphoric acid-modified asphalt already shows promise. In subsequent years, materials deleterious to Portland cement concrete will be examined. Aggregates suspected of deleterious properties will be analyzed by physical, chemical, and petrographic properties. Most research aggregates will be characterized by the Aggregate Image Measurement System for shape, angularity, and texture. The Micro-Deval test can also be a tool to see how aggregates breakdown in the presence of water. Potential issues include Minus No. 200 minerals and size, aggregate surface chemistry and absorption, development of a better methylene blue test for active clays, and evaluation of surfacing aggregates.
Laboratories:	Bituminous Mixtures Laboratory Chemistry Laboratory Concrete Laboratory Aggregate and Petrographic Laboratory
Start Date:	October 1, 2010
End Date:	September 30, 2013
Funding Amount:	$0.00
FHWA Program Name:	Innovative Pavement Research and Deployment
Goals:	Material characterization of minus No. 200 size materials on aggregate and their effect on the quality of bond at the aggregate surface both in asphalt and concrete mixtures.
Project Type:	Onsite
Background Information:	How much asphalt is lost by absorption in aggregate? Can it be reduced? How important is bond to aggregate in Portland cement concrete? This research is intended to lower construction costs by allowing the use of local aggregates that may be inferior because of the presence of small quantities of deleterious clays or other adverse properties or components. In year one, we plan to chemically characterize aggregates containing deleterious clays and investigate the mechanism of water absorption by such materials.
Test Methodology:	Examination of the nature of the fine materials in aggregate and how it effects the quality of the bond. Also the potential interaction of carbonate aggregate deterioration through reactivity and freezing and thawing pressures from absorbed water and deicing chemicals in aggregates and mixtures in service.
Other Information:	Data not yet available
Partners:	Data not yet available
More Information URL(s):
Fieldtest:	Data not yet available
Expected Benefits:	As the supply of quality aggregates diminishes, agencies will be forced to use locally available aggregates of lower standard. This research will enable agencies to better select local aggregates to construct long-lasting pavements.
Deliverables:	1. Name: Guidelines for the evaluation of the aggregate interface zone as affected by coatings, texture, minerals, and minus No. 200 fine materials. Product Type(s): Research report Description: Guidelines for the evaluation of the aggregate interface zone as affected by coatings, texture, minerals, and minus No. 200 fine materials. Report of the methods of testing and characterization tools found to be useful in examining the importance of the Interfacial Transition Zone (ITZ) at the boundary of the aggregate surface and the binder, whether it is an asphaltic material or a hydraulic cementitious paste. Audiences: Researchers, State highway agencies Secondary Audiences: Specifiers of aggregates and mixtures 2. Name: Report on the importance of ACR in concrete pavements containing carbonate coarse aggregates. Product Type(s): Research report Description: Report on the importance of ACR in concrete pavements containing carbonate coarse aggregates and whether ASR is also involved in pavement deterioration. Audiences: Academics, Concrete industry, Federal Highway Administration, Pavement engineers, Researchers Secondary Audiences: , Nanoresearchers, Aggregate producers, Portland cement concrete pavement (PCCP) contractors, Concrete producers
Related URL(s):
Project Findings:	Data not yet available
FHWA Topics:	Roads and Bridges--Pavement and Materials Research/Technologies--Turner-Fairbank Highway Research Center (TFHRC)
TRT Terms:	Coatings Aggregates Infrastructure Pavements Research Pavements Asphalt
FHWA Disciplines:	Pavement and Materials
Subject Areas:	Materials Pavements Research