Page 27 - GRIHA Manual Volume IV - Introduction to National Rating System
P. 27
18 Griha Manual: Volume 4
3. Methods such as `membrane curing' in which either a
liquid sealing compound (bituminous and paraffinic
emulsions, coal-tar cutbacks) or a non-liquid protective
coating (sheet plastics) can be applied to reduce the water
requirement for the hydration process of curing concrete.
The thin screen ensures that the moisture or water in the
concrete laid does not evaporate but is retained within
during the strength attainment processes. Membrane
curing is a more skilful operation than conventional moist
curing. Impermeable membranes such as plastic sheet
covering the concrete surface can also be used to provide
an effective barrier against evaporation. Membrane curing
does not control the temperature regime and, hence, this
has to be kept in mind when such methods are used.
Liquid membrane should have good alkali resistance, acid
resistance, adhesion-promoting qualities, and resistance Figure 2 Membrane curing with plastic
against degradation by UV light. The materials are limited sheet
to clear or translucent and white pigmented materials. Source http://pad3.wikihow.com/images/c/
cf/Curing-concrete-columns_796.jpg)
4. Chemical admixtures, such as high-range water reducers
(HRWR) or superplasticizers, could also be used to reduce
the curing water demand. They also
act as indirect accelerators.
5. Ponding, as illustrated in Figure 3, is
another way to reduce the demand for
curing water. It is done by forming a
wall (dam) of sand around the concrete
formation and then flooding it
with water.
6. Wax and resin-based curing
compounds could also be used to
reduce the curing water requirement. Figure 3 Use of ponding for curing
7. Pre-cast construction methodology where structural members are cast off the site in the
production environment can also help in reducing water use. In a production environment,
water is efficiently used through steam and hot water curing. Construction experts say the use of
chemical admixtures (plasticizers) improves the workability of the concrete even with reduced
water content. So, there is a net reduction in water consumption.
8. Other means for reducing water in the construction sector is the use of `dry partition works'
instead of block or brick masonry for partitions.
3. Methods such as `membrane curing' in which either a
liquid sealing compound (bituminous and paraffinic
emulsions, coal-tar cutbacks) or a non-liquid protective
coating (sheet plastics) can be applied to reduce the water
requirement for the hydration process of curing concrete.
The thin screen ensures that the moisture or water in the
concrete laid does not evaporate but is retained within
during the strength attainment processes. Membrane
curing is a more skilful operation than conventional moist
curing. Impermeable membranes such as plastic sheet
covering the concrete surface can also be used to provide
an effective barrier against evaporation. Membrane curing
does not control the temperature regime and, hence, this
has to be kept in mind when such methods are used.
Liquid membrane should have good alkali resistance, acid
resistance, adhesion-promoting qualities, and resistance Figure 2 Membrane curing with plastic
against degradation by UV light. The materials are limited sheet
to clear or translucent and white pigmented materials. Source http://pad3.wikihow.com/images/c/
cf/Curing-concrete-columns_796.jpg)
4. Chemical admixtures, such as high-range water reducers
(HRWR) or superplasticizers, could also be used to reduce
the curing water demand. They also
act as indirect accelerators.
5. Ponding, as illustrated in Figure 3, is
another way to reduce the demand for
curing water. It is done by forming a
wall (dam) of sand around the concrete
formation and then flooding it
with water.
6. Wax and resin-based curing
compounds could also be used to
reduce the curing water requirement. Figure 3 Use of ponding for curing
7. Pre-cast construction methodology where structural members are cast off the site in the
production environment can also help in reducing water use. In a production environment,
water is efficiently used through steam and hot water curing. Construction experts say the use of
chemical admixtures (plasticizers) improves the workability of the concrete even with reduced
water content. So, there is a net reduction in water consumption.
8. Other means for reducing water in the construction sector is the use of `dry partition works'
instead of block or brick masonry for partitions.
