When to start curing of concrete
When to Start Curing of Concrete. | Best Time for Concrete Curing.
hey guys welcome to civil mentor have
you ever wondered when to start curing
of concrete I know you did so let's
discuss it
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curing of concrete is the process of
maintaining moisture inside the freshly
casted concrete to continue the
hydration process and to achieve the
desired properties of hardened concrete
before starting curing concrete you
should know the actual behavior of the
freshly casted concrete once you know
and understand the behavior of concrete
very well then you will get a better
idea when to start curing of concrete
when we add water and dry concrete mix
hydration of cement will start
immediately and heat will be generated
inside the concrete without proper
hydration of cement concrete will never
gain the design strength when the
concrete is placed and compacted cement
slurry Rises through the surface of
concrete due to the settlement of
concrete in technical term this
phenomenon is called as bleeding in
concrete the rate and duration of
bleeding depend on many factors ie mix
proportion thickness or depth of
concrete concrete compaction method
water cement ratio etc there are so many
factors that affect the curing of
concrete it depends on the chemical
composition and find this of
cementitious materials
water cement ratio mixture proportions
aggregate characteristics chemical and
mineral lab mixtures added the
temperature of the concrete during
initial setting bleed water will
evaporate from the surface of the
concrete the rate of evaporation of
bleed water will depend on so many
factors ie air temperature and relative
humidity concrete temperature radiant
energy from the direct Sun and wind
velocities due to above described
factors concrete curing is carried out
in three phases and the length of time
depends on the concrete and
environmental conditions here we have
discussed these three stages one initial
curing during the initial setting
sometimes bleed water start evaporating
from the surface faster bam it is rising
out from the concrete if evaporation
happens faster than usual time then the
only factor that effect is the high
temperature when all the water gets
evaporated from the surface you need to
do some initial curing to minimize the
moisture loss during this period if you
do not start the curing it may lead to
plastic shrinkage cracks in concrete the
initial curing of concrete can also be
done by fogging to intermediate curing
sometimes intermediate curing is
necessary and is carried out when
finishing is completed but before the
concrete has reached its final set
during this period evaporation may need
to be reduced but the concrete is not
yet be able to tolerate the direct
application of water or the mechanical
damage resulting from the application of
plastic sheets in this stage liquid
forming membrane compound can be used
effectively to reduce evaporation loss 3
final curing
final curing is carried after final
finishing and after the concrete has
reached its final set final curing can
be done by application of wet covering
ie ponding method saturated burlap
spraying water curing compounds etc the
normal final setting time of cement is
six to eight hours
in short the curing should start after
minimum six hours final setting time of
cement and not less than 24 hours
thus when concrete curing has to start
is varies and depends on when the
surface of the concrete begins to dry
concrete curing should be started before
concrete surface loses its water and
undergo shrinkage this is very important
for concrete with low to very low water
cement ratio which does not have much
water to bleed to the surface that's all
for today see you in the next video
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