Which one is not a chemically inactive pore filling material?

Which of the following statement is incorrect about the function of admixtures?

Silica fume is usually added during ________

What is water proofing admixtures?

NaOH is the example of retenders.

Where do we use plasticizers?

Admixtures which cause early setting, and hardening of concrete are called ______

Damp proofing ______ resist water well enough.