Comparative Assessment of Deformation Under Plate Bearing Test and CBR Test for Subgrade Soil
A significant variation in the strength and deformation behavior of subgrade soil when tested in the laboratory and in the field. However, correlation of such variables is essential to evaluate the quality of the constructed subgrade. An attempt has been made in the present investigation to assess the deformation of control and stabilized subgrade soil in the laboratory and in the field. California bearing ratio (CBR) test was conducted in the laboratory and the static plate bearing test (PBT) was conducted in the field. Subgrade soil samples were stabilized with 6% lime, 17 % Cationic Emulsion, and combination of lime and emulsion. Similar stabilization was conducted at test sections in the field. The behavior of the control and stabilized soil in deformation under static PBT in the field and CBR in the laboratory was monitored and evaluated. It was noticed that polynomial correlation exists with high coefficient of determination between laboratory and field deformation for stabilized soil. It was observed that the deformation under CBR test decreased after implication of lime by (96 and 88) % for unsoaked and soaked testing conditions respectively. The deformation decreases by (92 and 85.6) % for unsoaked and soaked testing conditions respectively when emulsion was implemented. The deformation decreases by (91 and 88) % for unsoaked and soaked testing conditions respectively when combined stabilization was implemented. However, the deformation under PBT decreases by (75, 56, and 50) % for lime, emulsion, and combined stabilization processes respectively. It was concluded that testing condition (soaked or unsoaked) has no significant impact on the deformation of stabilized soil while it has a significant influence on the deformation of untreated soil under CBR test. On the other hand, the deformation of control soil shows no significant variation among field and laboratory testing in the model, however, the stabilized soil samples exhibit higher influence of field deformation on the polynomial models.
- M. Al-Khashab, M. Al-Hayalee, Stabilization of Expansive Clayey Soil Modified by Lime with an Emulsified Asphalt Addition, Engineering & Technology, 26(10) (2008).
- A. Arshad, E. Shaffie, F. Ismail, W. Hashim, N. Mat Daud, Z. Abd Rahman, Comparative evaluation of soil subgrade strength using laboratory and in-situ tests, International Journal of Civil Engineering and Technology, 9(7) (2018) 1184–1191.
- E. Seyman, (2003) Laboratory evaluation of in-situ tests as potential quality control/quality assurance tools, MSc. Thesis, Louisiana State University and Agricultural and Mechanical College, Louisiana.
- A. Hajiannia, M.T. Dorobati, S. Kasaeian, S.B. Baghbadorani, Correlation between the results of the PLT and CBR tests to determine the elasticity modulus, In Proceedings of the 5th International Conference on Geotechnical and Geophysical Site Characterisation, ISC 2016, Australian Geomechanics Society, (1) (2017) 701-706.
- D. Kuttah, Strong correlation between the laboratory dynamic CBR and the compaction characteristics of sandy soil, International Journal of Geo-Engineering, 10(1) (2019) 1-13. [DOI]
- Y. Du, N. Jiang, S. Liuc, S. Horpibulsuk, A. Arulrajah, Field evaluation of soft highway subgrade soil stabilized with calcium carbide residue, Soils and Foundations, 56 (2016) 301-314. [DOI]
- S. Sarsam, A. Al-Saidi, A. Al Taie, Influence of Combined Stabilization on the Structural Properties of Subgrade Soil, Journal of Geotechnical Engineering, 4(1), (2017) 13 -24.
- ASTM D2487, (2017) Standard practice for classification of soils for engineering purposes (unified soil classification system), ASTM International, West Conshohocken.
- ASTM D1883–07, (2007) Standard Test Method for CBR (California Bearing Ratio) of Laboratory-Compacted Soils, American Society for Testing and Materials (ASTM), West Conshohocken, PA.
- S. Sarsam, The role of Cationic emulsion in the strength characteristics of Gypseous soils. Proceedings, 8TH International Conference on Material Sciences (CSM8-ISM5), UNESCO Palace, Beirut–Lebanon, May 28-30, (2012).
- AASHTO T222, (2007) Nonrepetitive static plate load test of soil and flexible pavement components for use in evaluation and design of airport and highway pavements, American Association of State Highway and Transportation Officials, Washington, DC