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Q: The Los Angels abrasion value requirement for coarse aggregates used in water bound macadam for the base course
  • A. Between 60 to 70%
  • B. Between 40 to 50%
  • C. Between 0 to 40%
  • D. Between 50 to 60%
Correct Answer: Option C - Los Angels Abrasion or Hardness Test [IS:2386-1963]-Los Angels abrasion test is generally carried out to evaluate the hardness property of aggregates and to decide its suitability for different pavement construction works.  The principle of Los Angels abrasion test is to find the percentage wear due to the rubbing action between the aggregate and steel balls used as abrasive charge.  A maximum value of 40% percent is allowed for water bound macadam base course.  For bituminous concrete, a maximum value of 35% is specified.
C. Los Angels Abrasion or Hardness Test [IS:2386-1963]-Los Angels abrasion test is generally carried out to evaluate the hardness property of aggregates and to decide its suitability for different pavement construction works.  The principle of Los Angels abrasion test is to find the percentage wear due to the rubbing action between the aggregate and steel balls used as abrasive charge.  A maximum value of 40% percent is allowed for water bound macadam base course.  For bituminous concrete, a maximum value of 35% is specified.

Explanations:

Los Angels Abrasion or Hardness Test [IS:2386-1963]-Los Angels abrasion test is generally carried out to evaluate the hardness property of aggregates and to decide its suitability for different pavement construction works.  The principle of Los Angels abrasion test is to find the percentage wear due to the rubbing action between the aggregate and steel balls used as abrasive charge.  A maximum value of 40% percent is allowed for water bound macadam base course.  For bituminous concrete, a maximum value of 35% is specified.