Shear Modulus and Damping Ratio of Rubber-modified Asphalt Mixes and Unsaturated Subgrade Soils
Publication: Journal of Materials in Civil Engineering
Volume 14, Issue 6
Abstract
This paper presents the results of an investigation into the potential application of rubber-modified asphalt in railroad trackbeds by measuring its shear modulus and damping ratio. The measurements of the shear modulus and damping ratio were also conducted on typical subgrade soils. A number of resonant column tests were conducted on subgrade soil samples and the crumb rubber-modified asphalt (CRMA) mix samples with different rubber contents and rubber types. The fine crumb rubber is dissolved in the hot asphalt binder (for a period of time) as an additive to modify the properties of the binder. The measurements were conducted under a wide range of confining pressures and strain levels to simulate stress and strain conditions expected in the typical railway foundation. Cyclic triaxial tests were conducted on subgrade soil samples to study soil characteristics under dynamic loads. It was found that CRMA is a material with high shear stiffness and damping ratio, making it a very attractive material for vibration attenuation of railroad trackbeds.
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References
Asphalt Institute. (1998). “Hot mix asphalt for quality railroad and transit trackbeds.” Information Series IS-137, Lexington, Ky.
ASTM. (1992a). “Standard test methods for the determination of the modulus and damping properties of soils using the cyclic triaxial apparatus.” D 3999-91, West Conshohocken, Pa.
ASTM. (1992b). “Standard test methods for modulus and damping of soils by the resonant column method.” D 4015-87, West Conshohocken, Pa.
California Health Department. (1990). “Plan for recycling of hazardous waste in pavements.” Rep., Sacramento.
Drnevich, V. P. (1985). “Recent developments in resonant column testing.” Proc., Richart Commemorative Lectures, ASCE, New York, 79–107.
Federal Highway Administration (FHWA). (1992). “State of the practice—Design and construction of asphalt paving materials with crumb rubber modifier.” Rep. No. FHWA-SA-92-022, Washington, D.C.
Hansen, K. R., and Anderton, G. (1993). “A laboratory evaluation of recycled tire rubber in hot-mix asphalt paving systems.” Use of waste materials in hot-mix asphalt, ASTM STP 1193, H. F. Waller, ed., West Conshohocken, Pa.
Kentucky Transportation Center (KTC). (1994). “Development of guidelines and performance for asphalt concrete containing recycled rubber.” Rep. 94-27, Lexington.
Roschen, T. (2000). “Report on the status of rubberized asphalt traffic noise reduction in Sacramento County.” Rep. prepared for Sacramento County Public Works Agency.
Rose, J. G. (1986). “Performance and economics evaluation of hot mix asphalt trackbeds.” Proc., 98th Annual Conf. of Roadmasters and Maintenance-of-Way Association, Chicago, 119–133.
Rose, J. G. (1992). “Turnout rehabilitation with bituminous concrete underlayment.” Transportation Research Record 1341, Transportation Research Board, Washington, D.C., 75–82.
Rose, J. G. (1998). “Long-term performance, tests, and evaluation of asphalt trackbeds.” Proc., American Railway Engineering and Maintenance-of-Way Association Tech. Conf., Chicago.
Rose, J. G., and Hensley, M. J. (1991). “Performance of hot mix asphalt railway trackbeds.” Transportation Research Record 1300, Transportation Research Board, Washington, D.C., 35–43.
Strategic Highway Research Program (SHRP). (1991). “FOCUS.” Newsletter, July, Washington, D.C.
Zeng, X., Rose, J. G., and Rice, J. S.(2001). “Stiffness and damping ratio of rubber-modified asphalt mixes: Potential vibration attenuation for high-speed railway trackbeds.” J. Vib. Control, 7(4), 527–538.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 14 • Issue 6 • December 2002
Pages: 496 - 502
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Nov 14, 2000
Accepted: Oct 15, 2001
Published online: Nov 15, 2002
Published in print: Dec 2002
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