Hydrophobic Cement

This type of cement contains admixtures which decreases the weighting ability of cement grains. The equal hydrophobic admixtures are oxidized petrolatum, acid etc. This substances are added in amount of(0.06 to 0.03)% of the weight of the cement. The substance form a thin film around cement range .The film breakdown when concrete is mixed and normal hydration takes places.Its strength after 28 days is equal to the ordinary portland cement.It is most suitable for basements and for making water type concrete.