Reduction In Permeability Of Concrete, Mortar
And Plasters By A Chemical Which Retards Water
Percolation And Salt Transfer
Author(s)
B. Sengupta & A. K. Chakraborty
Abstract
Capillary rise, chloride and other salt penetration are the major causes of damage
to the structure and are closely related to permeability in concrete and mortar. In
fresh concrete, the space between the particles is completely filled up with water.
The excess water in pores evaporates after the concrete hardens. The loss of
moisture causes the volume of the paste to contract which in turn leads to
shrinkage stress and shrinkage cracking. Moisture vapor transmission is also a
function of relative humidity gradient between surfaces and permeability of
concrete. These result in salt efflorescence, corrosion in metals, alkali aggregate
reactions, sulphate attack through formation of gypsum and ettringite, freeze and
thaw disintegration, erosion, carbonation, etc. They have a serious destructive
effect on the structure as a whole. Heritage and old buildings which are devoid of
damp proof courses and anti-termite treatments are highly permeable to all these
natural damaging agents and need serious attention. This paper intends to discuss
the action of an indigenous chemical when applied in fresh concrete and injected
in mortars between brick layers for old and heritage houses. This chemical has
been able to reduce the permeability to a substantial extent and many of the
problems discussed above were, by and large, eliminated.
Keywords: Boral-chemical, permeability.
Keywords
Boral-chemical, permeability.
Related Book
Other papers in this volume
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