Phosphogypsum Slag Aggregate-Based Asphaltic Concrete Mixes
Publication: Journal of Transportation Engineering
Volume 122, Issue 4
Abstract
Phosphogypsum is a by-product from the production of phosphoric acid used in the fertilizer and chemical industries. Large production rates and problems associated with its stockpiling have led researchers to seek alternative uses for phosphogypsum, primarily as a construction material. One such use is the extraction of sulfur dioxide for the production of sulfuric acid, a process that also generates a by-product slag aggregate. This study investigated the feasibility of using this slag aggregate in asphaltic concrete binder course mixes. The physical properties of the slag aggregate, such as gradation, specific gravity, absorption, unit weight, and void content, were determined, as well as its durability and environmental characteristics. The Marshall mix design method was used to obtain the optimum asphalt content for this aggregate, while moisture susceptibility was examined using the boiling and modified Lottman tests. Indirect tensile, resilient modulus, and dynamic creep tests were performed on the mix to evaluate its performance potential. The results of the study indicate that phosphogypsum-based slag aggregate can be successfully employed in asphaltic concrete binder course mixtures.
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References
1.
AASHTO guide for design of pavement structures. (1993) Am. Assoc. of State Hwy. and Transp. Officials (AASHTO), Washington, D.C.
2.
The aggregate handbook. (1993). First Ann. Symp., R. D. Barksdale, ed., Int. Ctr. for Aggregate Res., National Stone Assoc., Washington, D.C.
3.
Barksdale, R. D. et al. (1990). “Laboratory determination of resilient modulus for flexible pavement design.”NCHRP Interim Rep. No. 1, Transp. Res. Board, Nat. Res. Council, Washington, D.C.
4.
Elliott, R. P., Ford, M. C., Ghanim, M., and Tu, Y. F. (1991). “Effect of aggregate gradation variation on asphalt mix properties.”Transp. Res. Rec. No. 1317, Transp. Res. Board, Nat. Res. Council, Washington, D.C.
5.
Foxworthy, P. T., Ott, Elfriede, and Seals, R. K. (1994). “Utilization of phosphogypsum-based slag aggregate in portland cement concrete mixtures.”Transp. Res. Rec. No. 1437, Transp. Res. Board, Nat. Res. Council, Washington, D.C.
6.
Groves, F. R. (1992). “Processes for recycling the sulfur content of phosphogypsum.”IRM Rep. No. I-92-2.
7.
Hadley, W. O., and Groeger, J. L. (1991). “Introduction to strategic highway research program—long-term pavement performance asphalt concrete resilient modulus testing program.”Transp. Res. Rec. No. 1353, Transp. Res. Board, Nat. Res. Council, Washington, D.C.
8.
Hicks, R. G. (1991). “Moisture damage in asphalt concrete.”NCHRP Synthesis of Hwy. Practice 175, Transp. Res. Board, Nat. Res. Council, Washington, D.C.
9.
Highway specifications workbook. (1991). Louisiana Dept. of Transp. and Devel., Baton Rouge, La.
10.
Khosla, N. P. (1991). “Effect of the use of modifiers on performance of asphaltic pavements.”Transp. Res. Rec. No. 1317, Transp. Res. Board, Nat. Res. Council, Washington, D.C.
11.
Little, D. N. (1991). “Performance assessment of binder-rich polyethylene-modified asphalt concrete mixtures (Novophalt).”Transp. Res. Rec. No. 1317, Transp. Res. Board, Nat. Res. Council, Washington, D.C.
12.
Lottman, R. P. (1978). “Predicting moisture-induced damage to asphaltic concrete.”NCHRP Rep. 192, Transp. Res. Board, Nat. Res. Council, Washington, D.C.
13.
Louisiana standard specifications for roads and bridges. (1992). Louisiana Dept. of Transp. and Devel., Baton Route, La.
14.
“Mix design methods for asphalt concrete and other hot-mix types.” (1990). Manual Series No. 2 ( MS-2 ), Asphalt Inst.
15.
Moore, B. L. (1990). “Material evaluation, DMK #5 Slag, 5/8” stockpile.”Rep. Prepared for Freeport-McMoRan, Inc., Barry L. Moore and Associates, Inc., June.
16.
“National emission standards for radon emissions from phosphogypsum stacks.” (1992). Rep., 40 CFR 61, Subpart R .
17.
Noureldin, A. S., and McDaniel, R. S. (1990). “Performance evaluation of steel furnace slag—Natural sand asphalt surface mixtures.”J., Assoc. of Asphalt Paving Technologists, 59.
18.
“Road and paving materials; Paving management technologies.” (1993). Annual Book of ASTM Standards, Vol. 04.03, ASTM, Philadelphia, Pa.
19.
Roberts, F. L., Kandhal, P. S., Brown, E. R., Lee, D., and Kennedy, T. W. (1991). Hot mix asphalt materials, mixture design, and construction, First Ed., NAPA Education Found., Lanham, Md.
20.
Seals, R. K., and Taha, R. (1991a). “Phosphogypsum literature review.”IRM Rep. I-90-4, Louisiana State Univ., Baton Rouge.
21.
Seals, R. K., and Taha, R. (1991b). “Engineering properties of phosphogypsum-based slag aggregate (A review of FMI's research results).”IRM Rep. 1-91-1, Louisiana State Univ., Baton Rouge.
22.
“Test methods for evaluating solid waste.” (1986). Vol. 1 and 2, SW 846, 3rd Ed., U.S. Environmental Protection Agency (EPA), Office of Solid Waste, Washington, D.C.
23.
Valkering, C. P., Lancon, D. J. L., deHilster, E., and Stoker, D. A. (1990). “Rutting resistance of asphalt mixes containing nonconventional and polymer-modified binders.”J., Assoc. of Asphalt Paving Technologists, 59.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 122 • Issue 4 • July 1996
Pages: 300 - 307
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Jul 1, 1996
Published in print: Jul 1996
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