Estimation of CBR value using Dynamic Cone Penetrometer

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Guru Nank Dev Engineering College, Ludhiana, Punjab, India-141006

The subbase/base thickness of pavement is governed by the CBR value of the subgrade soil along with some other parameters such as traffic intensity, climatic conditions, etc. Dynamic cone penetration test (DCPT) value conducted in the field can be used to estimate the CBR value provided a suitable relationship exists between CBR and DCPT value.

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K.S.Gill*, A.K. Choudhary **, J .N.Jha*,S.K.Shukla*** *Guru Nanak Dev Engg. College, Ludhiana,India **National Institute of Technology, Jamshedpur, India ***School of Engineering,Edith Cowan University,Perth Australia

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Chainage (Km) Insitu dry density (kN/m 3 ) Field moisture content (%) Optimum moisture content (%) Maximum dry density (kN/m 3 ) Compaction Level 4.25 19.20 2.4 9.5 19.70 97.46 5.25 18.80 3.2 9.5 19.70 95.43 6.25 17.55 3.4 9.6 19.55 89.76 7.25 16.95 3.8 9.6 19.50 86.92 8.25 18.50 2.9 9.6 19.50 94.87 9.25 18.00 3.1 9.4 19.75 91.13 10.25 16.85 3.9 9.5 19.55 86.18 11.25 16.80 3.9 9.5 19.60 85.71

Chainage (Km) Sand content(%) Liquid limit (%) Plasticity Index 4.25 70.0 16.5 NP 5.25 70.0 16.5 NP 6.25 68.5 17.0 NP 7.25 68.0 17.0 NP 8.25 66.5 17.2 NP 9.25 64.5 17.7 NP 10.25 65.0 17.5 NP 11.25 63.5 17.9 NP

Chainage (Km) Soaked Lab CBR at insitu density (%) Insitu CBR (%) based on DCPT Soaked insitu CBR (%) based on DCPT Insitu DCPI (mm/Blow) 4.25 10.94 14.40 7.20 14.70 5.25 10.59 13.50 6.75 15.55 6.25 8.95 12.10 5.87 17.15 7.25 8.50 10.80 5.40 19.00 8.25 9.94 13.24 6.68 15.83 9.25 10.12 12.95 6.41 16.20 10.25 7.61 10.24 5.09 19.90 11.25 7.61 10.20 5.07 19.98

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Estimation of CBR value using Dynamic Cone Penetrometer

1. K.S.Gill*, A.K. Choudhary **, J .N.Jha*,S.K.Shukla*** *Guru Nanak Dev Engg. College, Ludhiana,India **National Institute of Technology, Jamshedpur, India ***School of Engineering,Edith Cowan University,Perth Australia

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13. Chainage (Km) Insitu dry density (kN/m 3 ) Field moisture content (%) Optimum moisture content (%) Maximum dry density (kN/m 3 ) Compaction Level 4.25 19.20 2.4 9.5 19.70 97.46 5.25 18.80 3.2 9.5 19.70 95.43 6.25 17.55 3.4 9.6 19.55 89.76 7.25 16.95 3.8 9.6 19.50 86.92 8.25 18.50 2.9 9.6 19.50 94.87 9.25 18.00 3.1 9.4 19.75 91.13 10.25 16.85 3.9 9.5 19.55 86.18 11.25 16.80 3.9 9.5 19.60 85.71

14. Chainage (Km) Sand content(%) Liquid limit (%) Plasticity Index 4.25 70.0 16.5 NP 5.25 70.0 16.5 NP 6.25 68.5 17.0 NP 7.25 68.0 17.0 NP 8.25 66.5 17.2 NP 9.25 64.5 17.7 NP 10.25 65.0 17.5 NP 11.25 63.5 17.9 NP

15. Chainage (Km) Soaked Lab CBR at insitu density (%) Insitu CBR (%) based on DCPT Soaked insitu CBR (%) based on DCPT Insitu DCPI (mm/Blow) 4.25 10.94 14.40 7.20 14.70 5.25 10.59 13.50 6.75 15.55 6.25 8.95 12.10 5.87 17.15 7.25 8.50 10.80 5.40 19.00 8.25 9.94 13.24 6.68 15.83 9.25 10.12 12.95 6.41 16.20 10.25 7.61 10.24 5.09 19.90 11.25 7.61 10.20 5.07 19.98

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