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Q: Which of the following types of aggregate gives higher strength in concrete?
  • A. Flaky aggregate
  • B. Elongated aggregate
  • C. Rounded aggregate
  • D. Irregular aggregate
Correct Answer: Option D - In irregular aggregates, due to irregularity in shape they develop good strength and are suitable for making ordinary concrete. • Angular aggregate provide very good bond and are suitable for high strength concrete. • Angular aggregate have greater durability, interlocking nature, higher surface area and higher bond characteristics resulting in higher strength. • In rounded aggregate bond is poor as interlocking between particles is less thus unsuitable for high strength concrete. • Flaky and elongated aggregate make poor concrete.
D. In irregular aggregates, due to irregularity in shape they develop good strength and are suitable for making ordinary concrete. • Angular aggregate provide very good bond and are suitable for high strength concrete. • Angular aggregate have greater durability, interlocking nature, higher surface area and higher bond characteristics resulting in higher strength. • In rounded aggregate bond is poor as interlocking between particles is less thus unsuitable for high strength concrete. • Flaky and elongated aggregate make poor concrete.

Explanations:

In irregular aggregates, due to irregularity in shape they develop good strength and are suitable for making ordinary concrete. • Angular aggregate provide very good bond and are suitable for high strength concrete. • Angular aggregate have greater durability, interlocking nature, higher surface area and higher bond characteristics resulting in higher strength. • In rounded aggregate bond is poor as interlocking between particles is less thus unsuitable for high strength concrete. • Flaky and elongated aggregate make poor concrete.