Discussion
Which of the following tests is used to find the property of toughness of aggregates?
Answer: D
The aggregate impact test measures the toughness of aggregates, their resistance to failure by sudden shock or impact: a standard hammer is dropped on a sample in a mould and the fines produced are weighed. The crushing strength test gives the resistance to a slowly applied compressive load, the Los Angeles test gives resistance to wear (abrasion) by steel balls, and the angularity number test is a measure of the shape (angularity) of the particles. They measure strength, hardness and shape, and not toughness.
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