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What are the specifications for tamping rod used in impact test?

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What are the specifications for tamping rod used in impact test?

(a) 16 mm steel rod with rounded end

(b) 16 mm steel rod with square face

(c) 16 mm copper rod with rounded end

(d) 16 mm copper rod with square face

This question was addressed to me in an online interview.

This intriguing question comes from Tests on Stones in portion Materials for Construction of Basic Civil Engineering

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The correct answer is (a) 16 mm steel rod with rounded end

To explain: According to the IS code 2386, a 16 mm steel rod with rounded edge is used for tamping the sample filled inside the cylinder in three layers, 25 times each.

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