Estimating Engineering Properties of Cohesive Soils Using Atterberg Limits

Estimating Engineering Properties of
Cohesive Soils Using Atterberg Limits

1. Authors: 1) Ashkar Rahman Aquib Bangladesh University of Engineering & Technology 2)Md. Mohit Uzzaman Bangladesh University of Engineering & Technology 3) Dr. Md. Ferdous Alam Assistant Professor Department of Civil Engineering, Bangladesh University of Engineering & Technology July 20 23 Estimating Engineering Properties of Cohesive Soils Using Atterberg Limits

2. About Us Objectives To investigate the correlation between liquid limit obtained by both ASTM and BS methods and compare it with the previous researches. To explore the correlation between plastic limit obtained by both ASTM and BS methods and compare it with the previous investigations. To compare the shrinkage limit obtained by the method of (Holtz & Kovacs, 1981) with the shrinkage limit determined by laboratory experiment. To establish the correlations between Atterberg limits (liquid and plastic limits) and compaction characteristics (optimum moisture content and maximum dry density) and compare these with the literature. To find the relationship between plasticity index and drained angle of internal friction and justify it by comparing with previous studies. July 20 23

3. Literature Review About Us Jul y, 20 23 Shrinkage limit can be obtained from the graph of Plasticity Index vs Liquid Limit (Holtz & Kovacs, 1981) The relationship between maximum dry density and the plastic limit is γ dmax = 0.23*(93.3-PL) (Sridharan and Nagaraj, 2005) The relationship between optimum moisture content and the plastic limit is Maximum Dry Density OMC= 0.92*PL (Sridharan and Nagaraj, 2005) The relationship between plasticity Index and Internal Angle of Friction is (Sorensen and Okkels , 2013)  

4. Materials Total no. of test = 100 Total No. of Samples: 12 (Three from each type) Sample Type: CH , CL , MH , ML (USCS classification) Locations: Old Airport Project, BTCL Mohakhali Project, and BTCL Jessore Project Test Name No. of Test Hydrometer analysis (ASTM D422, D1140) 12 Specific gravity (ASTM D854) 12 LL (ASTM D4318) 12 PL (ASTM D4318) 12 LL (BS 1377) 12 PL (BS 1377) 12 Standard Proctor test (ASTM D698) 12 Shrinkage Limit test (ASTM D4943) 12 Drained Direct Shear test (ASTM D3080) 4 Jul y 20 23

5. Grain Size Distribution About Us Jul y 20 23

6. Specific Gravity Specific Gravity, Gs Sample G s CH Sample 1 2.57 Sample 2 2.58 Sample 3 2.71 CL Sample 1 2.58 Sample 2 2.51 Sample 3 2.70 ML Sample 1 2.71 Sample 2 2.72 Sample 3 2.75 MH Sample 1 2.65 Sample 2 2.72 Sample 3 2.74 Jul y 20 23

7. Correlation between LL BS and LL ASTM LL ASTM : 29% Jul y 20 23

8. Correlation between PL BS and PL ASTM PL ASTM : 8 % Jul y 20 23

9. Shrinkage Limit Determination of Shrinkage Limits From the PI vs LL graph (Holtz & Kovacs (1981) ) Jul y 20 23

10. Shrinkage Limit Sample Shrinkage Limit From Graph From Test CL Sample 1 15.05 15.76 Sample 2 18.89 18.47 Sample 3 14.30 14.69 CH Sample 1 15.24 15.35 Sample 2 14.61 14.71 Sample 3 16.21 16.67 ML Sample 1 23.13 27.89 Sample 2 21.74 22.36 Sample 3 20.56 19.03 MH Sample 1 31.08 33.52 Sample 2 23.85 25.46 Sample 3 24.91 23.32         Comparison between Shrinkage Limits From the Study of Holtz & Kovacs (1981) and Obtained Test Results Jul y 20 23

11. Shrinkage Limit Comparison between Shrinkage Limits From the Study of Holtz & Kovacs (1981) and Obtained Test Results SL theory = 0.8349* SL exp . + 2.7632; R² = 0.9269 Jul y 20 23

12. Relationship between OMC with Atterberg Limits by ASTM Method R 2 = 0.2455 Jul y 20 23

13. R 2 = 0.3904 R 2 = 0.082 Relationship between OMC with Atterberg Limits by BS Method Jul y 20 23

14. R 2 = 0. 6837 Relationship between MDD with Atterberg Limits by ASTM Method R 2 = 0. 1831 Jul y 20 23

15. Relationship between OMC with Atterberg Limits by BS Method R 2 = 0. 0883 R 2 = 0. 6738 Jul y 20 23

16. Variation of Plasticity Index with Internal Angle of Friction Jul y 20 23

17. Conclusion Jul y 20 23 Good correlations between Atterberg limits obtained by ASTM and BS method Validation of our experiment results for shrinkage limit by the method of Holtz & Kovacs, 1981 Poor correlations between OMC and Atterberg Limits by ASTM and BS method Poor correlations between MDD and Atterberg Limits by ASTM and BS method Validation of our drained direct shear test results by the method of Sorensen and Okkels , 2013

18. References About Us Jul y, 20 23 Das, B. M., & Sobhan , K. (2018). Principles of geotechnical engineering (Ninth Edition). Cengage Learning. Haigh, S. K., Vardanega , P. J., & Bolton, M. D. (2013). The plastic limit of clays. Géotechnique , 63(6), 435–440. https://doi.org/10.1680/geot.11.P.123 Sridharan, A., & Nagaraj, H. B. (2005). Plastic limit and compaction characteristics of finegrained soils. Proceedings of the Institution of Civil Engineers-Ground Improvement, 9(1), 17–22. Sorensen, K. K., & Okkels , N. (2013). Correlation between drained shear strength and plasticity index of undisturbed overconsolidated clays. Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, 1, 423–428. Holtz, R. D., & Kovacs, W. D. (1981). An introduction to geotechnical engineering. Prentice-Hall.

19. Acknowledgements The Laboratory In-Charge Our Honorable Supervisor Dr. Md. Ferdous Alam , Assistant Professor, Dept. of Civil Engineering, BUET All the Laboratory Employees Jul y 20 23

20. Thank You! Jul y 20 23