Pick up the correct statement from the following.

Mid-range water reducers result in at least _____ %.

Damp proofing cracks along with the foundation.

Spherical particles in silica fume has diameter of ___

The specific surface (m2/kg) of silica fume.

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

Damp proofing ________ resist water well enough.

What is the content of unburnt fuel in fly ash?