What are the standards for testing road macadam in Aggregate Impact Tests?

What are the standards for testing road macadam in Aggregate Impact Tests?

• A. 14 kg wt, 38 cm drop, 15 blows
• B. 14 kg wt, 35 cm drop, 20 blows
• C. 18 kg wt, 35 cm drop, 15 blows
• D. 14 kg wt, 30 cm drop, 20 blows

 

The correct answer is option A. 14 kg wt, 38 cm drop, 15 blows. Can you explain this answer in the comments?

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