Coal Ash Utilization in Asphalt Concrete Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 11, Issue 4
Abstract
Dwindling supplies and rising costs of natural resources used in road construction as well as concerns over shrinking landfill spaces prompt researchers to investigate the use of waste products, such as coal ash, as substitute materials in highway construction. This research examines the effect of coal ash (i.e., fly and bottom ash) when used as partial replacement of fine aggregate in asphalt concrete mixtures. Specimens were made using three aggregate sources, two ash sources, three ash percentages (0, 6, and 8%), and hydrated lime. Selected physical properties (e.g., tensile strength) were measured and statistically analyzed. Results indicated that partial substitution of fine aggregates by coal ash had a moderate detrimental effect on short-term tensile strengths. However, a number of coal ash/lime mixtures met the minimum tensile strength requirements set by the South Carolina Department of Transportation. A limited field study was also conducted to study the environmental effects of coal ash mixtures as detected by heavy-metal concentrations in nearby soils. Results showed that 3 months after placement metal concentrations in soils were not substantially altered.
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References
1.
Bretz, E. ( 1990). “Is there an afterlife for ash, FGD byproducts?” Electrical world, McGraw-Hill, New York.
2.
Ciesielski, S., and Collins, R. ( 1993). “Current nationwide status of the use of waste materials in hot mix asphalt mixtures and pavements.” Use of waste materials in hot-mix asphalt, ASTM STP 1193, ASTM, West Conshohocken, Pa.
3.
“Coal combustion by-product-production and consumption.” (1993). American Coal Ash Association, Washington, D.C.
4.
Collins, R. ( 1985). “Fly ash in bases and subbases.” Fly ash in highway construction, Demonstration Proj. No. 59, Federal Highway Administration, Washington, D.C.
5.
Collins, R., and Ciesielski, S. ( 1992). “Highway construction use of wastes and by-products.” Utilization of waste materials in civil engineering construction, ASCE, New York.
6.
“Concrete and aggregates.” (1990). Annual book of ASTM standards. Sect. 4, Vol. 4:02, West Conshohocken Pa.
7.
Crawley, A. (1992). “An evaluation of the use of power plant pond ash in highway construction.” Rep. No. MSHD-RD-92-085, Mississippi State Highway Department, Jackson, Miss.
8.
Dougan, C. (1991). “Past and current use of recycling materials by the Connecticut department of transportation.” Rep. No. 343-26-91-1, Connecticut Department of Transportation, Wethersfield, Conn.
9.
Federal Highway Administration. (1989). “Portland cement concrete materials manual.” Rep. No. FHWA/ED-89/006, Washington, D.C.
10.
“Mix design methods for asphalt concrete.” (1993). Manual Series No. 2 (MS-2), 6th Ed., The Asphalt Institute.
11.
“Pulverized fuel ash (PFA) utilization.” (1972). Central Electricity Generating Board.
12.
“Road and paving materials; pavement management technologies.” (1990). Annual book of ASTM standards, Vol. 4:03, West Conshohocken, Pa.
13.
Rosner, J., Chehovits, J., and Morris, G. (1982). “Fly ash as a mineral filler and anti-strip agent for asphalt concrete.” Proc., 6th Int. Ash Utilization Symp. Proceedings, The Challenge of Change, U.S. Department of Energy and National Ash Association.
14.
Suheibani, A. R. S. ( 1986). “The use of fly ash as an asphalt extender in asphalt concrete mixes,” PhD dissertation, Dept. of Civ. Engrg., University of Michigan, Ann Arbor, Mich.
15.
Tyson, S. ( 1988). “Recent progress in coal ash utilization and the effect of environmental issues and regulations.” Disposal and utilization of electric utility wastes, ASCE, New York.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 11 • Issue 4 • November 1999
Pages: 295 - 301
History
Received: Aug 30, 1994
Published online: Nov 1, 1999
Published in print: Nov 1999
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