00625168

Component

http://onlinepubs.trb.org...trr/1992/1345/1345-004.pdf

https://scholar.google.co...ston&publication_year=1992

Phosphogypsum is a solid by-product material resulting from the production of phosphoric acid, a major constituent of many fertilizers. It has been estimated that more than 800 million tons of phosphogypsum are stockpiled in the U.S. The current production rate exceeds 60 million tons per year, with less than 2% being recycled at the present time. The results of the laboratory phase of a research program to develop phosphogypsum as a road base material are presented. The research program included physical and chemical characterization of the phosphogypsum, mineralogical analysis, moisture-density relations, unconfined compressive strength testing, freeze-thaw and wet-dry durability tests, and expansion testing. A comparison is made between the engineering properties of phosphogypsum and the Louisiana Department of Transportation and Development requirements for road base materials.

This paper appears in Transportation Research Record No. 1345, Geoenvironmental and Engineering Properties of Rock, Soil, and Aggregate. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01404972

English

p. 28-35

1992

Transportation Research Record

0309052084

Figures (9) ; References (13) ; Tables (5)

Analysis; Base course (Pavements); Chemical properties; Compression tests; Expansion; Freeze thaw durability; Laboratory tests; Mineralogy; Physical properties; Recycling; Road construction; Swelling index

Expansion tests; Phosphogypsum

Geotechnology; Highways; Materials; I35: Miscellaneous Materials

TRIS, TRB, ATRI

Oct 22 1993 12:00AM

• ADSORPTION OF HEAVY METAL POLLUTANTS BY LANDFILL SOILS
• CONSTRUCTION AND PERFORMANCE OF A SHREDDED WASTE TIRE TEST EMBANKMENT
• CORROSION OF STEEL PILES IN SOME WASTE FILLS
• CORROSIVITY OF INDIANA BOTTOM ASH
• EFFECT OF CHLORIDE AND SULFATE CONTAMINATION IN SOILS ON CORROSION OF STEEL AND CONCRETE
• ENGINEERING PROPERTIES OF PHOSPHOGYPSUM-BASED SLAG AGGREGATE
• EVALUATION OF RECYCLED CONCRETE, OPEN-GRADED AGGREGATE, AND LARGE TOP-SIZE AGGREGATE BASES
• PERMEABILITY AND LEACHING CHARACTERISTICS OF FLY ASH LINER MATERIALS
• PHYSICAL AND ENVIRONMENTAL PROPERTIES OF ASPHALT-AMENDED BOTTOM ASH
• RECYCLED PLASTICS FOR HIGHWAY AGENCIES
• RECYCLING PROJECT: CONCRETE GRINDING RESIDUE
• STABILIZATION OF WATER TREATMENT PLANT SLUDGE FOR POSSIBLE USE AS EMBANKMENT MATERIAL
• USE OF CEMENT KILN DUST, FLY ASH, AND RECYCLING TECHNIQUE IN LOW-VOLUME ROAD REHABILITATION
• USE OF WASTE MATERIALS IN HIGHWAY CONSTRUCTION: STATE OF THE PRACTICE AND EVALUATION OF THE SELECTED WASTE PRODUCTS