Question

What will be the assumed standard deviation for mix design of M30 grade of concrete? (Subjected to the following conditions : good degree of site control having proper storage of cement, weight batching of all materials, controlled addition of water, regular checking of all materials, aggregate grading and moisture content and regular checking of workability and strength)

• A. 4.0 N/mm²
• B. 3.5 N/mm²
• C. 5.0 N/mm²
• D. 4.5 N/mm²

Answer 1

Answer: (C)