IS 2720-16 (1987): Methods of test for soils, Part 16 ...

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3 K. BHANDARI CentraLoB;z$ng Research Institute ( CSIR ) Members ADDITIONAL DIRECTOR ( GE ) Ministry of Railways JOINT DIRECTOR ( GE ) ( Alternate ) DR ALAM SINGH University of Jodhpur, Jodhpur DR M. L. OHRI ( Alternate ) SHRI B. ANJIAH Engineering Research Laboratories, Government of Andhra Pradesh, Hyderabad CHIEF ENGINEER ( IPRI ) Irrigation Department, Government of Punjab, Chandigarh DIRECTOR ( DAM ) ( Alternate ) I DR T. N. CHOJER Public Works Department. Government of Uttar Pradesh,Lucknow DEPUTY DIRECTOR ( R ) ( Alternate ) SHRI A.

4 VERGHESE CHUMMAR F. S. Engineers Private Limited, Madras SHRI C. ,V. JAYARAMAN ( Alternate ) SHRI C. S. DABKE Howe ( India ) Private Limited, New Delhi SHRI G. V. Murthy ( AIternate ) SHRI A. G. DASTIDAR In personal capacity ( 5 Hungerford Court, It/l, Hungerford Street, Calcutta ) DIRECTOR Central Soil and Materials Research Station, New Delhi JOINT DIRECTOR ( Alternate ) DIRECTOR ( JR1 ) Irrigation Department, Pradesh, Roorkee SHRI G. P. S. BHATI ( Alternate ) SBRI A. H. DIVANII Asia Foundations and Limited, Bombay SHRI A.

5 N. JANGLE ( Alternate ) Government of Uttar Construction ( Private ) ( Continued on page 2 ) 0 Copyright 1988 BUREAU OF INDIAN STANDARDS This publication is protected under theIndian Copyright Act ( XIVof 1957 ) and reproduction in whole or in part by any means except with written permission of the oublisher shall be deemed to be an infringement of copyright under the said Act IS : 2720 ( Part 16 ) - 1987 ( Continued from page 1 ) Members SHRI N. V. D SOUZA DR GOPAL RANJAN Representing Cemindia Company Limited, Bombay University of Roorkee, Roorkee; and Institution of Engineers ( India ) DR K.

6 B. AGGARWAL ( Alternate ) University of Roorkee, Roorkee &RI M. IYENGAR Engineers India Limited, New Delhi SHRI E. C. G. REDDY ( Alternate ) SHRI ASHOK K. JAIN G. S. Jain and Associates, New Delhi SHRI VIJAY K. JAIN ( Alternate ) SHRI C. B. LAKSHMANA RAO Karnataka Engineering Research Station, Government of Karnataka, Krishnaraja- sagar SHRI M. SURRAMANYAM ( Alternate ) SHRI A. V. S. R. MURTY Indian Geotechnical Society, New Delhi SHRI T. K. NATARAJAN Central Road Research Institute ( CSIR), New Delhi DR P. J. RAO.( Alternate ) SHRI RANIIT SINGH Ministry of Defence ( R&D ) SHRI V.

7 B. GHORPADE ( Alternate ) DR G. V,Rao Indian Institute of Technology, New Delhi DR K. K. GUPTA ( Alternate ) RESEARCH OFFICER ( B&RRL ) Public Works Department, Government of Punjab, Chandigarh SHRI R. K. SAXENA Roads Wing, Ministry of Shipping and Transport SHRI R. S. MAHALAHA ( Alternate ) SECRETARY Central Board of Irrigation and Power, New Delhi DIRECTOR ( C ) ( Alternate > SHRI U. N. SINHA Centr;ozr$i,d ng Research Institute ( CSIR ), SHRI SURENDRA KUMAR ( Alternate ) DR N. SOM Jadavpur University, Calcutta SHRI K. S. SRINIVASAN National Buildings Organization, New Delhi SHRI SUNIL BERRY ( Alternate ) COL R.)

8 R. SUDHINDRA Ministry of Defence ( Engineer-in-Chief s Branch ) SHRI S. S. JOSHI ( Alternate ) SUPERINTENDING ENGINEER ( P&D ) Public Works Department, Government of Tamil Nadu, Madras EXECUTIVE ENGINEER ( SMRD ) ( Alternate ) SHRI H. C. VERMA All India Instrument Manufacturers and Dealers Association, Bombay SHRI H. K. GUHA ( Alternate ) SHRI G. RAMAN, Director General, BIS ( Ex-officio hfember ) Director ( Civ Engg ) Secretary SHRI K. M. MATHUR Joint Director ( Civ Engg ), BIS ( Continued on page 15 ) 2 IS : 2720 ( Part 16 ) - 1987 Indian Standard Methods OF PART 16 LABORATORY (Second 0.)

9 FOR TEST FOR SOIL DETERMINATION OF Revision ) EWORII CBR This Indian Standard ( Part 16 > ( Second Revision ) was adopted by the Bureau of Indian Standards on 31 August 1987, after the draft finalized by the Soil Engineering Sectional Committee bad been approved by the Civil Engineering Division Council. In order to establish a uniform procedure for determination of various characteristics of soils and also for facilitating a comparative study of the results, an Indian Standard on Methods of test for soils 1s : 2720 has been brought about which is published in several parts.

10 This part ( Part 16 ) covers the laboratory method for determination of California Bearing Ratio ( CBR >. This method was used by the Cali- fornia State Highway Department in USA until 1950 for evaluating subgrade strengths for design of flexible pavements. The ratio is used in conjunction with curves evolved through a study of the performance of the flexible pavements. The CBR value of a soil cau thus be considered to be an index which in some fashion is related to its strength. The value is highly dependent on the condition of the material at the time of testing.)