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Highway Applications
The two types of coal combustion products used most often in highway construction are fly ash and bottom ash. Fly ash is used as a replacement for Portland cement in concrete and grout, as a fill material in embankments, as aggregate for highway subgrades and road base, and in flowable fill. Bottom ash is used as aggregate in concrete and in cold mixed asphalt, and as a structural fill for embankments and cement-stabilized bases for highway construction.
- Using Coal Ash in Highway Construction: A Guide to Benefits and Impacts (PDF) (50 pp, 2.4MB) contains more information on the use of coal combustion products in highway applications.
- Fly
Ash Facts for Highway Engineers (PDF) (81
pp, 6.1MB)
provides basic information about the uses of fly ash from the Federal Highway Administration. - Using Recycled Industrial Materials in Roadways (PDF) (4 pp, 1.1MB) discusses the use of industrial materials in roadways and other infrastructure projects as an alternative to virgin materials and construction products.
- Using
Recycled Industrial Materials in Buildings (PDF)
(4 pp, 538K) discusses
the use of industrial materials in roadways and
other infrastructure projects as an alternative
to virgin materials and construction products.
- Assessing Groundwater Impacts from Coal Combustion Products Used In Highways (PDF) (111 pp, 1.7MB) describes a computer application that was developed to assess impacts to groundwater caused by leaching of trace elements from CCPs used in highway construction.
- Metals Leaching from Highway Test Sections Constructed with Industrial Byproducts (PDF) (72 pp, 1.7MB) describes the results from a study assessing metals leaching from industrial byproducts used in highway construction.
- Recycled Materials in European Highway Environments: Uses, Technologies, and Polices (PDF) (134 pp, 1.8MB) is an FHWA sponsored document that reports on innovative policies, programs, and techniques that promote the use of recycled materials in the highway environment.
-
CIRCA Fact Sheets
A set of fact sheets produced by the Association of Canadian Industries Recycling Coal Ash (CIRCA) that provide technical information on CCP use in specific applications. - The American Association of State Highway Transportation
Officials (AASHTO) has developed standards for
using recycled industrial materials in cement
and concrete. AASHTO M 295 is the standard specification
for using fly ash in cement and concrete in roadways.
It is available for purchase from the AASHTO
Bookstore.
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.