01044088

Component

The high cost of landfilling and the potential uses of waste foundry sands have prompted research into their beneficial reuse. Roadways have a high potential for large volume usage of the foundry sands. A laboratory testing program was conducted on soil-foundry sand mixtures amended with cement and lime to assess their applicability as highway subbase materials. The mixtures were compacted in the laboratory at a variety of moisture contents and compactive efforts and subjected to unconfined compression and California bearing ratio tests. The environmental suitability of the prepared mixtures was evaluated by analyzing the effluent collected during column leaching tests. Finally, required subbase thicknesses were calculated using the laboratory-based strength parameters. The results of the study show that the strength of a mixture is highly dependent on the curing period, compactive energy, lime or cement presence, and water content at compaction. Laboratory leaching tests indicated that if these mixtures later come in contact with water that has been discharged directly to the environment (e.g., drainage through asphalt pavement), the quality of water will not be affected.

01042056

07-1109

English

23p

2007

Transportation Research Board 86th Annual Meeting

CD-ROM

Figures; Photos; References; Tables (5)

Asphalt pavements; California bearing ratio; Curing and setting agents; Drainage; Foundry sand; Laboratory tests; Leaching; Moisture content; Subbase (Pavements); Subbase materials; Thickness; Water quality

Hot water and sand mixture; Unconfined compressive strength

Geotechnology; Highways; Hydraulics and Hydrology; Pavements; I23: Properties of Road Surfaces; I41: General Soil Surveys

Transportation Research Board Annual Meeting 2007 Paper #07-1109

TRIS, TRB

Feb 8 2007 5:43PM