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The stone is said to be high if the toughness index of the stone in the impact test is:
1. Less than 9
2. More than 9
3. Less than 19
4. More than 19

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Correct Answer - Option 4 : More than 19

Concept:

Impact test:

Impact test is used to determining the toughness of stone, it is performed in an Impact Test Machine as followed:

  1. A cylinder of diameter 25mm and height 25mm is taken out from the sample of stones.
  2. It is then placed on the cast iron anvil of the machine.
  3. A steel hammer of weight 20N is allowed to fall axially in a vertical direction over the specimen.
  4. The height of the first blow is 1 cm, that of the second blow is 2 cm, that of the third blow is 3 cm, and so on.
  5. Blow at which specimen breaks is noted. If it is an nth blow, ‘n’ represents the toughness index of stone.

Toughness index

Toughness

< 13

Not tough

13-19

Moderately tough

> 19

High tough

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