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Deleterious Aggregates—Identification, Testing, Mitigation, and Use of Local Materials

Project Information

Project ID: 
FHWA-PROJ-10-0062
Project Status: 
Active
Start Date: 
Friday, October 1, 2010
End Date: 
Tuesday, September 30, 2014
FHWA Program: 
Infrastructure
FHWA Subprogram: 
Pavement and Materials
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 Discipline: 
Pavement and Materials
TRB Subject Area: 
Materials, Pavements, Research

Contact Information

First Name: 
Richard (Rick)
Last Name: 
Meininger
Telephone: 
(202) 493-3191
Team: 
Infrastructure Materials Team
Office:
Office of Infrastructure Research and Development
Office Code: 
HRDI-10

Project Details

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.

Goals

Material characterization of minus No. 200 size materials on aggregates and their effect on the quality of bond at the aggregate surface both in asphalt and concrete mixtures.

Deliverables

Deliverable Name: 
Guidelines for the evaluation of the aggregate interface zone as affected by coatings, texture, minerals, and minus No. 200 fine materials
Deliverable Type: 
Research report or guidelines
Deliverable 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.
Deliverable Name: 
Report on the importance of alkali-carbonate reaction (ACR) in concrete pavements containing carbonate coarse aggregates.
Deliverable Type: 
Research report or guidelines
Deliverable Description: 
Report on the importance of ACR in concrete pavements containing carbonate coarse aggregates and whether alkali-silica reactivity (ASR) is also involved in pavement deterioration.