How to Prevent and Control Efflorescence
Formation on Masonry Structures?
Definition
Efflorescence is a
fine, white, powdery deposit or patches of water-soluble salts precipitate on
the surface of masonry as the water evaporates. These efflorescent salt deposits
tend to appear at the worst time; usually about a month after the building
is constructed, and sometimes as long as a year after completion of
building. It reduces the building strength and spoils the appearance of the
building.
Control
of Efflorescence
1.
Selection of suitable construction materials
Selected
construction materials should free from efflorescence. It has less alkaline in
nature. Added it should have less water absorption capacity.
The water
used for construction purpose should be clear enough. If the water is alkaline
in nature the possibility of efflorescence is high.
2.
Proper design and detailing
Water tight
masonry work is adopted for construction. Joints should pack perfectly and joints
should design properly. Trim materials are usually applied in locations which
are considerably weak to water ingression for example coping, caps, and sills
under window.
These
materials are possibly contains salt that increase the chance of efflorescence
formation.
3.
Good construction practice
Cover the
material with cement pack so as to reduce the building material contact with
the water.
Construction
work should be in proper way. The joints should pack perfectly. Proper workmanship
is highly required to reduce the water stagnate
Removal
of Efflorescence
1.
Simple washing
2.
Power washing
3.
Sand blasting
4. Chemical cleaning
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