Chemically active pore fillers ______ the setting of concrete.

Content of SiO2 in silica fume is _______

Damp proofing ________ resist water well enough.

Nomenclature of water proofing agent.

Water proofing admixtures are available in powder, paste or liquid and gaesous form.

Chemically inactive pore fillers ________ the workability.

The addition of the admixture to the mix ______ the surface tension.

Damp proofing is done with a ______ based mixture.