DHARMSOIL STABILISATION 72317.8 ‘CBR Test is an arbitrary test’, justify. Describe the procedure for conducting the CBR test in the
field. Surcharge loads are used in the CBR test; explain their significance.
(S.V.U.—Four-year B.Tech.—Sep, 1983)
17.9 Write brief critical notes on the CBR test and its use.
(S.V.U.—B.Tech., (Part-time)—Sep., 1983 B.E., (R.R.)—Dec., 1970)
17.10 (a) Under what circumstances is CBR test conducted under saturated condition?
(b) Under what circumstances is CBR test conducted on:
(i) Compacted samples and (ii) Undisturbed samples.
(S.V.U.—Four-year B.Tech.—Apr., 1983)
17.11 What is CBR test? What are its uses? Describe in detail the CBR test with neat sketches.
(S.V.U.—Four-year B.Tech.—Oct., 1982)
17.12 Give a critical review of the methods of evaluating the CBR of subgrade soils.
(S.V.U.—B.E., (Part-time)—Dec., 1981)
17.13 Briefly describing the test procedure, explain how CBR is used to design flexible pavements.
(S.V.U.—B.E., (R.R.)—Sep., 1978, Nov., 1975, June, 1972, Dec., 1981)
17.14 Describe the standard procedures for California Bearing Ratio test in the laboratory and in the
field. (S.V.U.—B.E., (R.R.)—May, 1975)
17.15 Describe the ‘‘CBR’’ test. What is the standard for comparison in this test?
(S.V.U.—B.E., (R.R.)—May, 1970)
17.16 Describe the CBR test procedure and explain the usefulness of the test in pavement design.
(S.V.U.—B.E., (R.R.)—Dec., 1971 and Dec., 1970)
17.17 The following results were obtained for a CBR test on compacted soil:
Penetration (mm) 1.25 2.50 3.75 5.00 7.50 10.00 12.50
Load (kN) 0.32 1.32 2.40 3.32 4.32 4.96 5.35
Assuming the standard loads as 14.72 kN and 22.07 kN for penetrations of 2.5 mm and 5.0 mm
respectively, determine CBR for the soil. (S.V.U.—B.E., (R.R.)—May, 1969)
17.18 The CBR values of a proposed subgrade, base and sub-base are 6%, 15%, and 50% respectively.
Determine the thicknesses, required for the base, sub-base and surface courses for light traffic
conditions.