For a standard proctor test, the mass of hammer and the drop of hammer are as follows:
- A2.60 kg and 310 mmCorrect
- B2.60 kg and 450 mm
- C4.89 kg and 310 mm
- D4.8 kg and 450 mm
Solution
Concept
Standard Proctor compaction test specifications
Formula
NONE
Step-by-step solution
1. In the standard proctor compaction test, standard specifications define the hammer mass and drop height. 2. The mass of the hammer specified for the standard proctor test is 2.60 kg. 3. The height of drop for this hammer is 310 mm. Answer: A
Explanation
In standard soil testing specifications, the Standard Proctor compaction test utilizes a rrammer or hammer weighing 2.60 kg dropped from a set height of 310 mm. This specific mass and drop height provide the standard nominal energy needed to evaluate soil compaction characteristics. Higher masses and drop heights are reserved for the Modified Proctor test.
Why the other options are wrong
B) The drop height for the standard proctor test hammer is 310 mm, not 450 mm. C) A 4.89 kg hammer is used in the modified proctor test, not the standard proctor test. D) A mass of 4.8 kg and a 450 mm drop correspond to the modified proctor test.
Shortcut
Standard Proctor = 2.6 kg hammer with a 310 mm drop.
Common mistake
Confusing the Standard Proctor test specifications with the heavier weight and drop height of the Modified Proctor test.
Correct answer: A) 2.60 kg and 310 mm