Question

In a modified proctor test compaction of soils, the mass of the rammer is of ______ and dropped at a height of ______.

1. 2.6 kg; 310 mm
2. 2.6 kg; 450 mm
3. 4.89 kg; 310 mm
4. 4.89 kg; 450 mm

Answer 1

Correct Answer - Option 4 : 4.89 kg; 450 mm

Explanation:

(i)The Indian Standard Equivalent of the Standard Proctor Test is called the light compaction test (IS: 2720 Part VII - 1974).

(ii) The Indian Standard Equivalent of the Modified Proctor Test is called the heavy compaction test (IS: 2720 Part VII - 1983).

In compaction test:

Property	IS light compaction test	IS Heavy Modified compaction test
Weight of hammer	2.6 kg	4.9 kg
Number of Layers	3	5
Number of blows	25	25
Hight of fall	310 mm	450 mm
Volume of mould	1000 cc	1000 cc