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Q: Proper experimental knowledge about the porosity and water absorption capacity of a coarse aggregate is required as its affects the durability of concrete because of: I. Freezing and thawing II. Reaction with chemically reactive fluids III. Increasing the workability of concrete
  • A. Both (i) and (ii)
  • B. Only (i)
  • C. (i), (ii), and (iii)
  • D. Only (ii)
Correct Answer: Option C - Porosity–The entrapped air bubbles in the rocks during their formation lead to minute hales or cavities known as pores. The porosity of the aggregate will also affect the durability of the concrete when the concrete is subjected to chemically aggregate liquids. The pores may become reservoirs of free moisture inside the aggregate resulting in loss of workability of concrete. The percentage of water absorbed by an aggregate when immersed in water is termed as the absorption of aggregate. The porous aggregate absorb more moisture, resulting in loss of workability of concrete at a much faster rate.
C. Porosity–The entrapped air bubbles in the rocks during their formation lead to minute hales or cavities known as pores. The porosity of the aggregate will also affect the durability of the concrete when the concrete is subjected to chemically aggregate liquids. The pores may become reservoirs of free moisture inside the aggregate resulting in loss of workability of concrete. The percentage of water absorbed by an aggregate when immersed in water is termed as the absorption of aggregate. The porous aggregate absorb more moisture, resulting in loss of workability of concrete at a much faster rate.

Explanations:

Porosity–The entrapped air bubbles in the rocks during their formation lead to minute hales or cavities known as pores. The porosity of the aggregate will also affect the durability of the concrete when the concrete is subjected to chemically aggregate liquids. The pores may become reservoirs of free moisture inside the aggregate resulting in loss of workability of concrete. The percentage of water absorbed by an aggregate when immersed in water is termed as the absorption of aggregate. The porous aggregate absorb more moisture, resulting in loss of workability of concrete at a much faster rate.