Study of Stabilized Expansive Soil as Subgrade under Extreme Climatic Conditions
Publication: Geo-Extreme 2021
ABSTRACT
Heaving is a common problem experienced with the high-plasticity clays due to water-absorption in pavement structures. Under an excessive amount of precipitation, typically in humid areas, water infiltration and absorption can lead to significant heaving on the surface of the subgrade. If this type of situation is not monitored properly, it can lead to excessive stress at the base of the pavement which in turn can lead to tensile cracks at the surface and can lead to disastrous effects. To overcome these typical problems, the in situ high-plasticity clays in subgrade are often replaced with chemically stabilized soil up to a certain depth. The chemically stabilized soil prevents a significant amount of heaving at the surface by reducing the swelling potential of the high-plasticity clays to a great extent. In this study, a nontraditional stabilizer, namely, lignosulfonate has been chosen and compared for the enhancement of the performance of the subgrade system. Basic tests are carried out to ascertain the effects of chemicals. Swell tests, followed by consolidation and UCS tests have been performed to fix the optimum amount of chemical. Further, to check on the efficacy of the stabilized soil in a pavement utilizing the optimum amount, a brief numerical analysis has been carried out to estimate the heaving in a humid region at different intervals of a year. Lignosulfonate has been found to give good results in terms of a decrease in heaving at an optimum content of 3% of the mass of soil.
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REFERENCES
ASTM. (1999). Standard Test Method for Shrinkage Factors of Soils by the Mercury Method 1. D4943-18, West Conshohocken, PA.
ASTM. (2000). Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer.” D854, West Conshohocken, PA.
ASTM. (2004). Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis. D6913-04, West Conshohocken, PA.
ASTM. (2005). Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils. D4318, West Conshohocken, PA.
ASTM. (2011). Standard Test Methods for One-Dimensional Swell or Collapse of Cohesive Soils 1. D4546-14, 1–9, West Conshohocken, PA.
ASTM. (2012). Test Method for Laboratory Compaction Characteristics of Soils Using Standard Effort (12.400 ft-lbf/ft 3 (600 kN-m/m 3))”, D698-12. West Conshohocken, PA.
Adem, H. H., and Vanapalli, S. K. (2016). “Heave Prediction in a Natural Unsaturated Expansive Soil Deposit Under a Lightly Loaded Structure.” Geotechnical and Geological Engineering, Springer International Publishing, 34(4), 1181–1192.
Fredlund, D. G., and Xing, A. (1994). “Equations for the soil-water characteristic curve.” Can. Geotech. J., 31(3), 521–532.
Houston, S. L., Bharadwaj, A., Welfert, B., Houston, W. N., and Walsh, K. D. (2016). “Unsaturated Soil Mechanics Principles to Remove and Replace Mitigation for Expansive Clays.” Journal of Geotechnical and Geoenvironmental Engineering, 142(4), 04015102.
Jayanthi, P. N. V., and Singh, D. N. (2016). “Utilization of sustainable materials for soil stabilization: State-of-the-art.” Advances in Civil Engineering Materials, 5(1), 46–79.
Murty, V. R., and Praveen, G. V. (2008). “Use of Chemically Stabilized Soil as Cushion Material below Light Weight Structures Founded on Expansive Soils.” Journal of Materials in Civil Engineering, 20(5), 392–400.
Saride, S., Puppala, A. J., and Chikyala, S. R. (2013). “Swell-shrink and strength behaviors of lime and cement stabilized expansive organic clays.” Applied Clay Science, Elsevier B.V., 85(1), 39–45.
Soltani, A., Taheri, A., Khatibi, M., and Estabragh, A. R. (2017). “Swelling Potential of a Stabilized Expansive Soil: A Comparative Experimental Study.” Geotechnical and Geological Engineering, Springer International Publishing, 35(4), 1717–1744.
Tingle, J. S., and Santoni, R. L. (2003). “Stabilization of Clay Soils with Nontraditional Additives.” Transportation Research Record, II(1819), 72–84.
Global Modeling and Assimilation Office (GMAO). (2015), MERRA-2 tavg1_2d_slv_Nx: 2d,1-Hourly,Time-Averaged,Single-Level,Assimilation,Single-Level Diagnostics V5.12.4, Greenbelt, MD, USA, Goddard Earth Sciences Data and Information Services Center.
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Geo-Extreme 2021
Pages: 178 - 188
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© 2021 American Society of Civil Engineers.
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Published online: Nov 4, 2021
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