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Q: Which of the following statements about gap grading of aggregates is true?
  • A. In gap grading, one or more intermediate fractions of particles are absent.
  • B. In gap grading, the grading curve is smooth.
  • C. In gap grading, all the particles are of uniform size.
  • D. Gap graded has wide distribution of all grain sizes present.
Correct Answer: Option A - Aggregate is gap-graded when intermediate sizes are absent from the gradation curve, on the grading curve, gap-grading is represented by a horizontal line over the range of sizes omitted. In gap-graded one or more intermediate fractions of particles are absent. These are dissented from continuously graded conventional aggregate.
A. Aggregate is gap-graded when intermediate sizes are absent from the gradation curve, on the grading curve, gap-grading is represented by a horizontal line over the range of sizes omitted. In gap-graded one or more intermediate fractions of particles are absent. These are dissented from continuously graded conventional aggregate.

Explanations:

Aggregate is gap-graded when intermediate sizes are absent from the gradation curve, on the grading curve, gap-grading is represented by a horizontal line over the range of sizes omitted. In gap-graded one or more intermediate fractions of particles are absent. These are dissented from continuously graded conventional aggregate.