Geotechnical Engineering

DHARM

430 GEOTECHNICAL ENGINEERING

27 f

361.5

52 f

60 f

25

25

13

6,

12 holes

f

Guide length

of travel of

rammer 310 mm

6,

4 holes

f

(a) For light compaction

335

50 f

50 f

20

65 f

Rammer

(Adjust to make

total weight

26 N)

15 mm thick

rubber gasket

27 f

581.5

52 f

60 f

25

25

13

6,

12 holes

f

Guide length

of travel of

rammer 450 mm

6,

4 holes

f

500

130

50 f

20

65 f

Rammer

(Adjust

total weight

48.9 N)

1.5 mm thick

rubber gasket

25 f

Note:

1. Essential dimensions
   underlined


2. All dimensions in mm

(b) For heavy compaction
Fig. 12.6 Typical metal rammer for compaction (ISI)
The ratio of fraction passing 20-mm IS Sieve and retained on 4.75-mm IS Sieve to the
soil passing 4.75-mm IS Sieve should be determined. The material retained on and passing
4.75-mm IS Sieve should be mixed thoroughly to obtain about 160 to 180 N of soil specimen.
(In case the material passing 20-mm IS Sieve and retained on 4.75-mm IS Sieve is more than
20%, the ratio of such material to that passing 4.75-mm IS Sieve should be maintained for
each test. IF it is less than 20%, the material passing the 20-mm IS Sieve may be directly
used).