In concrete mix design, the target mean compressive strength is calculated from the specified characteristic strength and the
Correct answer: D. Standard deviation and a statistical margin
- A. Slump value and air content
- B. Aggregate impact value and abrasion value
- C. Cement fineness and initial setting time
- D. Standard deviation and a statistical margin
Explanation
Target mean strength is set above the characteristic strength by an allowance based on production variability, commonly expressed using standard deviation. This helps ensure that the required characteristic strength is achieved consistently.
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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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