Geotechnical Engineering

DHARM

COMPACTION OF SOIL 429

60 50

A

B 3 pins to formcatch for

extension

Removable

extension

5 C

10

Push

fit

E

Two lugs

brazed on

D

F

Detachable

base plate

15

Smooth

finish

Position of

square base

plate

XX

10 10 Three lugs

brazed on

All dimensions

in mm

Approx

Section XX

Volume cm^3 A dia. B C dia. D E dia F

1000 100 127.3 110 150 120 180 φ or 150 sq.

2250 150 127.3 160 200 170 230 φ or 200 sq.

Fig. 12.5 Typical mould for compaction (ISI)
A representative sample weighting about 200N and passing 50-mm IS Sieve of the thor-
oughly mixed air-dried material is taken. This is made to pass through 20-mm and 4.75-mm IS
Sieves, separating the fractions retained and passing these sieves. Care should be exercised so
as not to break the aggregates while pulverizing. The percentage of each fraction is deter-
mined. The fraction retained on 20-mm IS Sieve should not be used in the test. The percent-
ages of soil coarser than 4.75-mm IS Sieve and 20-mm IS Sieve should be determined.