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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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