Texturing
Finished concrete has a smooth surface; texturing of
concrete surface is done to impart required skid
resistance to the concrete surface. The texturing
is done by means of wire brushing or grooving along
the transverse direction. Initial texturing may be
done at the time of construction of the paver itself
(refer Figure 37). Final texturing is done no sooner
the sheen of the concrete surface goes off ( Swanlund
and Vanikar 2002 ).
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Figure-37 Texturing
of finished surface by texturing machine
( photo courtesy: Mr. Ashutosh Gautam,
Project Director, NHAI, Kanpur ) |
Concrete curing
Curing is a process in
which requisite moisture content and temperature
is maintained so that concrete achieves its design
strength through hydration of cement. For initial
curing, curing compound with high water
retentivity may be spread over the finished surface
to prevent rapid drying of water. For final curing,
continuous ponding or moistened hessain/
gunny bags should be kept for about a fortnight
(refer Figure 38). As an alternative arrangement
to ponding, impervious liquid maybe spread over the
surface so as to restrict evaporation of water from
the laid concrete. Forms are removed from the freshly
prepared concrete layer after about curing of fourteen
hours (IRC:15
2002, Chakroborty
and Das 2003).
|
Figure-38 Curing
of finished concrete pavement ( photo
courtesy: Mr. Ashutosh Gautam, Project Director,
Kanpur, NHAI ) |
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