Waterproofing a Concrete
Concrete
is porous which absorbs water, waterborne contaminants and chemicals that can
cause deterioration if not waterproof.
Waterproofing
of concrete is done by either suitable extraneous treatments like applying
paints, fixing bitumen felts etc. or internally by suitable design of
the concrete mix, addition of suitable admixtures in
the concrete or mortar at the time of mixing and/or installing water
bars at the joints.
Requirement of /waterproofing
Admixture for Concrete
Water
is the main important part of concrete through the making to placing procedure.
After it gains its strength moisture or water penetration will harm the
concrete if it remains in concrete. This can cause due to corrosion of
reinforcement or due to freeze thaw.
To
come out of this problem porosity should be reduced. Concrete is porous
material and water can go through the pores material and micro-cracks due to
capillary actions. Thus there is a need of admixture which can control the
porosity of concrete.
Waterproofing of Concrete by
bituminous or Tar Coating
Bitumen
(asphalt or coal-tar) is a mixed material made up of organic liquid that are
highly sticky, viscous, and waterproof. It is applied prior to the
concrete surface or masonry surface before applying the first mopping coat.
This will help to create bond of the bitumen with the concrete roof deck or
masonry surface.
Bitumen Felt : Application for
Tanking
Bituminous
felt is used for laying the waterproof course on the outside and inside of the
walls and bases of structures. The bitumen felt should be hessian base and/or
fibre base as specified in Drawing/Schedule of items. This type of
waterproofing are generally done by specialised firms.
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