Question

For complete hydration of cement the water-cement ratio needed 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

On an average 23% of water by weight of cement is required for chemical reaction with portland cement compounds. About 15% water by weight of cement is required to fill the gel-pore. Thus 38% water by weight is required for chemical reaction and gel pores. If more than 38% of water is used, the excess will cause undesirable cavities.