U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| Project Information | ||
| Project ID: | FHWA-PROJ-14-0005 | |
| Project Name: | Hydration Kinetics of High-Volume Fly Ash Mixtures for Concrete Paving Applications | |
| Project Status: | Proposed | |
| Start Date: | March 3, 2014 | |
| End Date: | December 31, 2020 | |
| Contact Information | ||
| Last Name: | Arnold | |
| First Name: | Terry | |
| Telephone: | 202-493-3305 | |
| E-mail: | terry.arnold@dot.gov | |
| Office: | Office of Infrastructure Research and Development | |
| Team: | Pavement Materials Team [HRDI-10] | |
| Laboratory: | Chemistry Laboratory | |
| Project detail | ||
| Roadmap/Focus area(s): | Infrastructure Research and Technology Strategic Plan and Roadmap | |
| Project Description: | Develop an understanding of the chemistry and phases that occur in fly ashes derived from different sources of coal and produced by different power plants. We will track the chemical and phase changes that occur during the hydration of cement pastes containing fly ashes and use this information to investigate ways of speeding up the reaction. When this information has been developed we will investigate the chemistry of the scaling resistance of these concretes to deicing chemicals. | |
| Goals: | Accelerate the setting time of very high-volume fly ash mixtures so they can be used in conventional concrete paving applications. | |
| Background Information: | Cement manufacture is well known to be the major contributor to greenhouse gases (carbon dioxide) in the world. Replacement of some cement by fly ash (a waste product from coal burning power plants) is already being practiced. Replacement of cement with very high levels of fly ash produces concrete that is stronger than conventional portland cement concrete. The major issues with its use are extended setting times and poor scaling resistance when exposed to deicing chemicals. The major focus of this research to investigate the hydration kinetics of high-volume fly ash (HVFA) with special emphasis on developing an understanding of the changes in the chemistry and phase changes that take place as the levels of fly ash are increased. | |
| Product Type: | Article Draft standard, specifications, or guidelines Research report | |
| Test Methodology: | Detailed characterization of unhydrated and hydrated phases in fly ash mixtures. Techniques used will include quantitative x-ray diffraction analysis, environmental scanning electron microscopy, x-ray fluorescence analysis, inductively coupled plasma spectroscopy, thermogravimetric analysis, and petrography. | |
| Expected Benefits: | Utilization of waste byproduct, reduced greenhouse gases. | |
| Deliverables: | Name: New classification for fly ash.
Method of accelerating the hydration of high-volume fly ash (HVFA) mixtures.
Method of improving the resistance of HVFA concrete to deicing chemicals. Product Type(s): Research report, Draft standard, specifications, or guidelines, Article Description: Current classification for fly ash (Type C or F) does not accurately reflect performance of the material.High volumes of fly ash delay the setting of concrete.Concretes containing high volumes of fly ash generally have poor resistance (scaling) to deicing chemicals. | |
| FHWA Topics: | Roads and Bridges--Design | |
| TRT Terms: | Infrastructure Greenhouse Gases Research Materials Concrete Fly Ash Cement Hydration X ray analysis |
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| FHWA Disciplines: | Pavement and Materials |
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| Subject Areas: | Materials |
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