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Q: The most useless aggregate is one whose surface texture is
  • A. glassy
  • B. granular
  • C. honey combed & porous
  • D. smooth
Correct Answer: Option A - The most useless aggregate is glassy surface texture of aggregate. • Honey combed with visible pores and cavities are useless aggregate. • Granular aggregate facture showing more or less uniform rounded grains. • A smooth aggregate will have microscopic porous even though it may appear smooth to us hence can form bonds with cement at microscopic level but glossy aggregate lacks its microscopic rough surface hence will not form good bond with cement paste.
A. The most useless aggregate is glassy surface texture of aggregate. • Honey combed with visible pores and cavities are useless aggregate. • Granular aggregate facture showing more or less uniform rounded grains. • A smooth aggregate will have microscopic porous even though it may appear smooth to us hence can form bonds with cement at microscopic level but glossy aggregate lacks its microscopic rough surface hence will not form good bond with cement paste.

Explanations:

The most useless aggregate is glassy surface texture of aggregate. • Honey combed with visible pores and cavities are useless aggregate. • Granular aggregate facture showing more or less uniform rounded grains. • A smooth aggregate will have microscopic porous even though it may appear smooth to us hence can form bonds with cement at microscopic level but glossy aggregate lacks its microscopic rough surface hence will not form good bond with cement paste.