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

Project Information

Project ID: 
FHWA-PROJ-10-0062
Project Abstract: 

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.

Research HUB ID: 
7820
Project Status: 
Active
Project Funding Amount (Contract Award Amount): 
$0
Start Date: 
Friday, October 1, 2010
End Date: 
Tuesday, September 30, 2014
Public Access Plan: 
No
Laboratory: 
Asphalt Binder and Mixtures Laboratory (ABML), Chemistry Laboratory, Concrete Laboratory, Aggregate and Petrographic Laboratory
FHWA AMRP Program: 
Infrastructure
FHWA AMRP Activity: 
Pavement and Materials

Contact Information

Team: 
Infrastructure Materials Team
Office:
Office of Infrastructure Research and Development
Office Code: 
HRDI-10

Deliverables