Question

For complete hydration of cement, the water cement ratio is :

• A. Less than 0.25
• B. More than 0.25 but less than 0.35
• C. More than 0.35 but less than 0.45
• D. More than 0.45 but less than 0.60

Answer 1

The correct option is C More than 0.35 but less than 0.45

Ans. (c) : On an average 25% of water by weight of cement is required for chemical reaction with Portland cement compounds. About 17% water by weight of cement is required to fill the gel-pores. Thus 42% of water by weight is required for chemical reaction and gel pores. If more than 42% of water is used, the excess will cause undesirable cavities.