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Q: Which of the following statements is INCORRECT?
  • A. Lower water-cement ratio leads to lower workability.
  • B. Graphically, the relation between the strength of concrete and the water-cement ratio is approximate cubic.
  • C. Lower water-cement ratio is required when the concrete mix is mechanically compacted to achieve higher strength as compared to the hand-compacted concrete mix with higher water-cement ratio.
  • D. Lower water-cement ratio is, the higher will be the strength of concrete.
Correct Answer: Option B - Water cement ratio–It shows ratio of cement and water utilized in the preparation of concrete. • If the percentage of water used is less, then there will not be a sufficient quantity of water to hydrate cement. It will be result in weak and porous concrete. • Too much water results in the segregation of aggregates and gives porous concrete of low strength and low density. • Concrete strength is reduced with the increase in the water cement ratio. • The graph showing the relationship between the strength and water cement ratio is approximately hyperbolic in shape.
B. Water cement ratio–It shows ratio of cement and water utilized in the preparation of concrete. • If the percentage of water used is less, then there will not be a sufficient quantity of water to hydrate cement. It will be result in weak and porous concrete. • Too much water results in the segregation of aggregates and gives porous concrete of low strength and low density. • Concrete strength is reduced with the increase in the water cement ratio. • The graph showing the relationship between the strength and water cement ratio is approximately hyperbolic in shape.

Explanations:

Water cement ratio–It shows ratio of cement and water utilized in the preparation of concrete. • If the percentage of water used is less, then there will not be a sufficient quantity of water to hydrate cement. It will be result in weak and porous concrete. • Too much water results in the segregation of aggregates and gives porous concrete of low strength and low density. • Concrete strength is reduced with the increase in the water cement ratio. • The graph showing the relationship between the strength and water cement ratio is approximately hyperbolic in shape.