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Impact strength of concrete is greater for:
i) water stored concrete than for dry concrete
ii) angular crushed aggregates
iii) rounded aggregates
The correct answer is:
- a)only (i)
- b)only (ii)
- c)(i) and (ii)
- d)(i) and (iii)
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Impact strength of concrete is greater for:i) water stored concrete th...
Impact strength of concrete is assessed usually by the ability of a concrete specimen to withstand repeated blows and to absorb energy.
The impact strength of water stored concrete is found to be lower than when the concrete is dry.
For the same compressive strength, impact strength is greater for concrete made with coarse aggregate of greater angularity and surface roughness. Angularity number for angular crushed aggregate is more than that of rounded aggregate, therefore impact strength of angular crushed aggregate is more than that of rounded aggregates.
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Impact strength of concrete is greater for:i) water stored concrete th...
Explanation:
Impact strength of concrete refers to its ability to resist sudden loads or shocks. It is influenced by various factors such as the water-cement ratio, type of aggregate, curing method, and so on. Among the given options, only angular crushed aggregates have a positive impact on the impact strength of concrete. Here's why:
Impact strength of concrete and water-cement ratio:
- The water-cement ratio is the most crucial factor that affects the strength of concrete.
- Higher the water-cement ratio, lower will be the strength of the concrete. This is because excess water reduces the bond between cement and aggregate, making it weaker.
Impact strength of concrete and angular crushed aggregates:
- Angular crushed aggregates have a rough surface texture with sharp edges and corners.
- When mixed with cement, these aggregates interlock with each other, resulting in a strong and durable concrete.
- The rough surface texture also offers better grip to the cement paste, improving the bond strength.
Impact strength of concrete and rounded aggregates:
- Rounded aggregates have a smooth surface texture with no sharp edges or corners.
- When mixed with cement, these aggregates do not interlock well, resulting in a weaker concrete.
- The smooth surface texture also offers less grip to the cement paste, reducing the bond strength.
Conclusion:
Based on the above discussion, it is clear that only option (ii) - angular crushed aggregates - have a positive impact on the impact strength of concrete. Option (i) - water stored concrete - has no relevance to the impact strength, and option (iii) - rounded aggregates - can actually reduce the impact strength of concrete.
Impact strength of concrete refers to its ability to resist sudden loads or shocks. It is influenced by various factors such as the water-cement ratio, type of aggregate, curing method, and so on. Among the given options, only angular crushed aggregates have a positive impact on the impact strength of concrete. Here's why:
Impact strength of concrete and water-cement ratio:
- The water-cement ratio is the most crucial factor that affects the strength of concrete.
- Higher the water-cement ratio, lower will be the strength of the concrete. This is because excess water reduces the bond between cement and aggregate, making it weaker.
Impact strength of concrete and angular crushed aggregates:
- Angular crushed aggregates have a rough surface texture with sharp edges and corners.
- When mixed with cement, these aggregates interlock with each other, resulting in a strong and durable concrete.
- The rough surface texture also offers better grip to the cement paste, improving the bond strength.
Impact strength of concrete and rounded aggregates:
- Rounded aggregates have a smooth surface texture with no sharp edges or corners.
- When mixed with cement, these aggregates do not interlock well, resulting in a weaker concrete.
- The smooth surface texture also offers less grip to the cement paste, reducing the bond strength.
Conclusion:
Based on the above discussion, it is clear that only option (ii) - angular crushed aggregates - have a positive impact on the impact strength of concrete. Option (i) - water stored concrete - has no relevance to the impact strength, and option (iii) - rounded aggregates - can actually reduce the impact strength of concrete.
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