Addition of Lime and Fly Ash to Improve Highway Subgrade Soils
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 4
Abstract
Laboratory tests have been carried out in order to evaluate the improvement in engineering properties relevant to highway design and construction obtained when clayey subgrade soils are stabilized with lime or fly ash. The experimental program included California bearing ratio (CBR) tests to evaluate the bearing strength of stabilized soils used as working platforms during highway construction. The admixture of lime or fly ash caused an increase in the plasticity limit, while both the liquid limit and the plasticity index of the soils have been reduced. Substantial increases in the California bearing ratio value, higher than those of the soil–fly ash mixtures, have been obtained when the soil samples were mixed with lime. The swelling after a 4-day soaking period has been reduced with the addition of both additive materials. The increase in optimum moisture content acts subsidiarily to the increased CBR value, particularly at high lime or fly ash percentages. An analogous effect has been found for the maximum dry density reduction.
Get full access to this article
View all available purchase options and get full access to this article.
References
AASHTO. (2004). “Standard method of test for moisture-density relations of soils using a 4.54-kg (10-lb) rammer and a 457-mm (18-in.) drop.” T 180-01, Washington, DC.
AASHTO. (2003). “Standard method of test for the California Bearing Ratio.” T 193-99, Washington, DC.
ASTM. (2003). “Standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete.” C618, West Conshohocken, PA.
ASTM. (2000). “Standard test methods for liquid limit, plastic limit, and plasticity index of soils.” D4318, West Conshohocken, PA.
Arora, S., and Aydilek, A. H. (2005). “Class F fly ash amended soils as highway base materials.” J. Mater. Civ. Eng., 640–649.
Athanasopoulou, A., and Kollaros, G. (2011). “Use of additives to improve the engineering properties of swelling soils in Thrace, Northern Greece.” 5th Int. Conf. on Computational Materials Characterization, WIT Press, Southampton, 327–338.
Bell, F. G. (1989). “Lime stabilization of clay soils.” Bull. Int. Assoc. Eng. Geol., 39(1), 67–74.
Holland, J. E., and Griffin, C. (1980). “Cement and lime stabilization of Melbourne pavement subgrade soils.” 3rd Australia-New Zealand Conf. on Geomechanics, Vol. 1, ARRB Group, Vermont South VIC, 1191–1195.
Li, L., Edil, T. B., and Benson, C. H. (2009). “Properties of pavement geomaterials stabilized with fly ash.” 2009 World of Coal Ash (WOCA) Conf., Univ. of Kentucky Center for Applied Energy Research, Lexington, KY.
Qubain, B. S., Seksinsky, E. J., and Li, J. C. (2000). “Incorporating subgrade lime stabilization into pavement design.”, Transportation Research Board, Washington, DC.
Rao, A. S., and Rao, M. R. (2008). “Swell-shrink behaviour of expansive soils under stabilized fly ash cushions.” 12th Int. Conf. of International Association for Computer Methods and Advances in Geomechanics (IACMAG), Curran Associates, New York, 1539–1546.
Information & Authors
Information
Published In
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 16, 2012
Accepted: May 17, 2013
Published online: May 20, 2013
Discussion open until: Oct 20, 2013
Published in print: Apr 1, 2014
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.