Chemically Stabilized Soft Clays for Road-Base Construction
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 7
Abstract
Soft clays are widely distributed in Missouri, United States. Due to their relatively low strength and high compressibility, subgrade construction in soft clays has encountered many difficulties. In recent practice, the use of fly ash (FA) along with lime to tackle soft subgrade problems has shown promising results. The effectiveness of Class C FA and lime kiln dust (LKD) in clay subgrade stabilization is examined in this research. Scanning electron microscopic (SEM) analysis, proctor compaction tests, unconfined compression tests, and resilient modulus tests were carried out on the FA and LKD modified soil mixtures. Test specimens were prepared at optimum water content and tested at various curing periods. The test specimens were reconstituted by static compression. Test results revealed that the addition of Class C FA could increase the dry unit weight of the FA treated soil, enhance the unconfined compressive strength, and improve the resilient modulus. Regression equations were developed to correlate the resilient modulus with curing time. The mechanism of FA stabilization was discussed based on the SEM results and the measurement of the electrical conductivity of the FA-soil-water system. Correlations between the unconfined compressive strength and resilient modulus were developed. It is concluded that subgrade stabilization with Class C FA and LKD are cost-effective for road-base construction.
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References
AASHTO. (2007). “Standard method of test for determining the resilient modulus of soils and aggregate materials.” T307-99, Washington, DC.
Alvarez-Ayuso, E., et al. (2008). “Environmental, physical and structural characterisation of geopolymer matrixes synthesised from coal (co-) combustion fly.” J. Hazard. Mater., 154, 175–183.
ASTM. (2004). “Standard test method for characterizing fly ash for use in the soil stabilization.” D5329-04, West Conshohocken, PA.
ASTM. (2012). “Standard test method for laboratory compaction characteristics of soil using standard effort.” D698-12, West Conshohocken, PA.
ASTM. (2013). “Standard test method for unconfined compressive strength of cohesive soil.” D2166-13, West Conshohocken, PA.
Burnham, J. C., Hatfield, N., Bennett, G. F., and Logan, T. J. (1992). “Use of kiln dust with quicklime for effective municipal sludge pasteurization and stabilization with the N-Viro soil process.” Innovations and uses for lime, 128–141.
Cetin, B., Aydilek, A. H., Guney, Y. (2010). “Stabilization of recycled base materials with high carbon fly ash resources.” Conserv. Recycling, 54(11), 878–892.
Chang, D. T., Chiang, C. E., and Chang, C. Y. (1991). “Modified testing device to evaluate properties on fly-ash-treated subgrade soil.” J. Geotech. Eng., 14(1), 88–95.
Cokca, E. (2001). “Use of class C fly ashes for the stabilization of an expansive soil.” J. Geotech. Geoenviron. Eng., 568–573.
Daita, R. K., Drnevich, V. P., Kim, D., and Chen, R. (2006). “Assessing the quality of soils modified with lime kiln dust measuring electrical conductivity with time domain reflectometry.”, Transportation Research Board, Washington, DC, 101–109.
Edil, T., Benson, C., Bin-Shafique, S., Tanyu, B., Kim, W., and Senol, A. (2002). “Field evaluation of construction alternatives for roadway over soft subgrade.”, Transportation Research Board, Washington, DC, 36–48.
Ferguson, G. (1993). “Use of self-cementing fly ashes as a soil stabilization agent.” Fly ash for soil improvement, 1–14.
Fredlund, D. G., Bergan, A. T., and Wong, P. K. (1977). “Relation between resilient modulus and stress conditions for cohesive subgrade soils.”, Transportation Research Board, Washington, DC, 73–81.
Heckel, G., and Wahab, R. (1996). “Soil stabilization utilizing alternative waste materials.” Proc., 4th Materials Engineering Conf., Vol. 1, ASCE’s Materials Engineering Div., 318–327.
Horpibulsuk, S., Rachan, R., and Raksachon, Y. (2009). “Role of fly ash on strength and microstructure development in blended cement stabilized silty clay.” Soil. Found., 49(1), 85–98.
Kang, X., Kang, G., and Ge, L. (2013). “Modified time of setting test for fly ash paste and fly ash-soil mixtures.” J. Mater. Civ. Eng., 296–301.
Khoury, N. N., and Zaman, M. M. (2004). “Correlation between resilient modulus, moisture variation, and soil suction for subgrade soils.”, Transportation Research Board, Washington, DC, 99–107.
Liang, R. Y., Rabab’ah, S., and Khasawneh, M. (2008). “Predicting moisture-dependent resilient modulus of cohesive soils using soil suction concept.” J. Transp. Eng., 34–40.
Lloyd, R. R., Provis, J. L., and van Deventer, J. S. J. (2009). “Microscopy and microanalysis of inorganic polymer cements. 2: The gel binder.” J. Mater. Sci., 44, 620–631.
McManis, K. L., and Arman, A. (1989). “Class C fly ash as full or partial replacement for portland cement or lime.”, Transportation Research Board, Washington, DC, 68–81.
Miller, M. M., and Callaghan, R. M. (2004). “Lime kiln dust as a potential raw material in portland cement manufacturing.”, USGS, U.S. Dept. of the Interior, Washington, DC.
Misra, A. (1998). “Stabilization characteristics of clays using class C fly ash.”, Transportation Research Board, Washington, DC.
Moghal, A. A. B., and Sivapullaiah, P. V. (2011). “Effect of pozzolanic reactivity on compressibility characteristics of stabilized low lime fly ashes.” Geotech. Geol. Eng., 29, 665–673.
Mohammad, L. N., Herath, A., Rasoulian, M., and Zhang, Z. (2006). “Laboratory evaluation of untreated and treated pavement base materials.”, Transportation Research Board, Washington, DC, 78–88.
Pandian, N., and Krishna, K. (2003). “The pozzolanic effect of fly ash on the California bearing ratio behavior of black cotton soil.” J. Test. Eval., 31(6), 479–485.
Parsa, J., Munson-McGee, S. H., and Steiner, R. (1996). “Stabilization/solidification of hazardous wastes using fly ash.” J. Environ. Eng., 935–940.
Pinilla, J. D., Miller, G. A., Cerato, A. B., and Snethen, D. S. (2011). “Influence of curing time on the resilient modulus of chemically stabilized soils.” Geotech. Test. J., 34(4), 1–9.
Puppala, A. J., Ramakrishna, A. M., and Hoyos, L. R. (2003). “Resilient moduli of treated clays from repeated load triaxial test.”, Transportation Research Board, Washington, DC, 68–74.
Saylak, D., Mishra, S. K., Mejeoumov, G. G., and Shon, C.-H. (2008). “Fly ash-calcium chloride stabilization in road base construction.”, Transportation Research Board, Washington, DC, 23–29.
Shon, C.-H., Saylak, D., and Mishra, S. K. (2010). “Combined use of calcium chloride and fly ash in road base stabilization.”, Transportation Research Board, Washington, DC, 120–129.
Sobhan, K., and Krizek, R. J. (1998). “Resilient properties and fatigue damage in stabilized recycled aggregated base course material.”, Transportation Research Board, Washington, DC, 28–37.
Solanki, P., Zaman, M. M., and Dean, J. (2010). “Resilient modulus of clay subgrades stabilized with lime, class C fly ash, and cement kiln dust for pavement design.”, Transportation Research Board, Washington, DC, 101–110.
Vasquez, E., and Alonso, E. E. (1981). “Fly ash stabilization of decomposed granite.” Proc., 10th Int. Conf. on Soil Mechanics and Foundations Engineering, Balkema, Rotterdam, Netherlands, 391–395.
Wang, D., et al. (2003). “Conversion of fly ash cenosphere to hollow microspheres with zeolite/mullite composite shells.” Adv. Funct. Mater., 13(7), 563–567.
Wen, H., Warner, J., Edil, T., and Wang, G. (2010). “Laboratory comparison of crushed aggregate and recycled pavement material with and without high carbon fly ash.” Geotech. Geol. Eng., 28(4), 405–411.
Werkmeister, S., Dawson, A. R., and Wellner, F. (2001). “Permanent deformation behavior of granular materials and the shakedown concept.”, Transportation Research Board, Washington, DC, 75–81.
White, D. J., Harrington, D. S., and Thomas, Z. (2005). “Fly ash soil stabilization for non uniform subgrade soils.” Engineering properties and construction guidelines, Vol. I, Center for Transportation Research and Education, Iowa State Univ., IA.
Xu, A., and Sarkar, S. L. (1994). “Microstructural development in high-volume fly-ash cement system.” J. Mater. Civ. Eng., 117–136.
Yang, S. R., Huang, W. H., and Liao, C. C. (2008). “Correlation between resilient modulus and plastic deformation for cohesive subgrade soil under repeated loading.”, Transportation Research Board, Washington, DC, 72–79.
Zia, N., and Fox, P. J. (2000). “Engineering properties of loess-fly ash mixtures for roadbase construction.”, Transportation Research Board, Washington, DC, 49–56.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 7 • July 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 4, 2014
Accepted: Jul 1, 2014
Published online: Aug 19, 2014
Discussion open until: Jan 19, 2015
Published in print: Jul 1, 2015
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