What could be the possible answer among the following for water cement ratio for high strength concrete?

What does x3 in power’s experiment stands for?

HPC is not used in high span bridges.

High Performance concrete works out to be economical.

What is the percentage of the accelerator by weight in UHPC?

According to figure, what is the approximate value of strength of 50mm cube in MPa for gel-space ratio .6?

Concrete having 28- days’ compressive strength in the range of 60 to 100 MPa.

What does 240 in power’s experiment stand for?