In a concrete mix design, the target mean strength is normally set above the specified characteristic strength to allow for
Correct answer: B. Normal production variation
- A. Complete elimination of curing
- B. Normal production variation
- C. Reduction of aggregate volume
- D. Increase in setting time
Explanation
The target mean strength exceeds the specified characteristic strength so that normal variations in materials, batching and workmanship do not cause excessive low-strength results. The margin does not eliminate the need for curing or change setting time.
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About Concrete Technology
Concrete technology covers cement, aggregates, water and admixtures, including their properties, proportioning and effect on fresh and hardened concrete. It explains workability, water-cement ratio, setting, hydration, strength, durability, curing, mix design and common defects, while distinguishing segregation and bleeding from general loss of workability.
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