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Consider the following statements: 1) workability of concrete increases with the increase in the proportion of water content 2) Concrete having small-sized aggregates is more workable than that containing large-sized aggregate 3) For the same quantity of water, rounded aggregates produce a more workable concrete mix as compared to angular and flaky aggregates 4) A concrete mix with no slump shown in the slump cone test indicates its very poor workability Which of the above statements are correct?

Consider the following statements: 1) workability of concrete increases with the increase in the proportion of water content 2) Concrete having small-sized aggregates is more workable than that containing large-sized aggregate 3) For the same quantity of water, rounded aggregates produce a more workable concrete mix as compared to angular and flaky aggregates 4) A concrete mix with no slump shown in the slump cone test indicates its very poor workability Which of the above statements are correct? Correct Answer 1, 3 and 4 only

Factors affecting the workability of concrete

Key points

Water content
  • It is generally expressed in terms of the water-cement ratio.
  • High water content indicates a high workability of concrete and vice versa.

Rich mix proportion
  • Rich mix has sufficient cement aggregates, hence it will have a proper lubrication, thus increasing workability.

Size of aggregate
  • Aggregate with Finer particles have more surface area,  hence requires more water to make it workable.
  • Aggregate with coarser particles requires less water to make it workable.
  • Hence for fixed water content large-sized particles are more workable.

 

Shape of aggregate
  • The irregular shape of aggregate requires more water to make it workable, due to greater surface area.
  • Rounded shape aggregate requires less water to make it workable, due to less surface area.
  • Hence for fixed water content rounded aggregate has more workability.

Temperature
  • High temperature reduces the workability of concrete and increases the slump loss.

Use of admixtures
  • Admixtures such as air-entraining admixtures increase the workability of concrete.

Related Questions

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