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Consider the following statements
1) Strength of concrete cube is inversely proportional to water-cement ratio.
2) A rich concrete mix gives higher strength than a lean concrete mix since it has more cement content.
3) Shrinkage cracks on concrete surface are due to excess water in mix.
Which of the following statements is correct?
  • a)
    1,2 and 3
  • b)
    1 and 2
  • c)
    1 and 3
  • d)
    1 only
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Consider the following statements1) Strength of concrete cube is inver...
Lower the water cement ratio higher the concrete strength.
A rich concrete due to greater cement content will possess higher strength in comparison to lean cement.
Higher the water content in mix higher will be the shrinkage in concrete.
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Most Upvoted Answer
Consider the following statements1) Strength of concrete cube is inver...
Strength of concrete cube is inversely proportional to water-cement ratio:
The water-cement ratio is an important parameter in concrete mix design. It represents the ratio of the weight of water to the weight of cement used in the mix. When the water-cement ratio is high, it means that more water is used in the mix, which leads to a lower strength of the concrete. This is because excess water in the mix leads to a higher porosity and weaker bond between the cement particles. On the other hand, when the water-cement ratio is low, it means that less water is used in the mix, which results in a higher strength of the concrete. This is because a lower water-cement ratio leads to a denser concrete with better bonding between the cement particles.

A rich concrete mix gives higher strength than a lean concrete mix since it has more cement content:
The strength of concrete is directly influenced by the cement content. A rich concrete mix refers to a mix with a higher cement content, while a lean concrete mix refers to a mix with a lower cement content. When there is more cement in the mix, there are more cement particles available to hydrate and form a strong bond, resulting in higher strength. Conversely, when there is less cement in the mix, there are fewer cement particles available for hydration, leading to a weaker bond and lower strength. Therefore, a rich concrete mix with more cement content will generally give higher strength compared to a lean concrete mix.

Shrinkage cracks on concrete surface are due to excess water in mix:
Shrinkage cracks on the concrete surface are primarily caused by the drying shrinkage of the concrete. When water is added to the mix, it reacts with cement to form a paste that hardens and binds the aggregates together. As the concrete dries and loses moisture, it undergoes shrinkage. If excess water is present in the mix, it evaporates during the drying process, leaving behind voids and causing the concrete to shrink more. This excessive shrinkage can result in the formation of shrinkage cracks on the concrete surface. Therefore, excess water in the mix can contribute to shrinkage cracks on the concrete surface.

Conclusion:
From the given statements, it can be concluded that all three statements are correct. The strength of concrete cube is indeed inversely proportional to the water-cement ratio. A rich concrete mix with more cement content generally gives higher strength compared to a lean concrete mix. Shrinkage cracks on the concrete surface can be caused by excess water in the mix. Therefore, the correct answer is option 'A' - all three statements are correct.
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