this is a detailed ppt of curing of concrete

1. CURING OF
CONCRETE

2.  MADE BY : RUSHABH H SHAH
 ROLL NO: 852
 DISP : SYCS
 TOPIC : CURING OF CONCRETE

3. CURING OF CONCRETE
 Curing may be defined as the operation
of maintaining humidity and temperature
of freshly placed concrete during some
definite period following placing ,casting
or finishing to assure satisfactory hydration
of cement and proper hardening of the
concrete
 If the curing is neglacted in early period of
hydration, the quality of concrete will
experience some irreparable loss

4. METHODS OF
CURING
WATER CURING
APPPLICATION OF
HEAT
MEMBRANE CURING
MISCELLANEOUS

5. WATER CURING
 This is the best method of curing as it
satisfies all the requirement of curing,
namely, promotion of hydration,
elimination of shrinkage and absorption of
heat of hydration. It is pointed out that
even if the membrane method is
adopted it is desirable that a certain
extent of water curing is done before the
concrete is covered with membrane

6. TYPES OF WATER CUING
 IMMERSION
 PONDING
 SPRAYINGOR FOGGING
 WET COVERING

7. MEMBRANE CURING
 Sometimes concrete work is carried out
at a place where there is shortage of
water. Therefore lavish application of
water in curing is not possible it has been
pointed out that curing does not means
application of water ,it also means to
create uninterrupted and progressive
hydration

8. MEMBRANE CURING

9. APPLICATION OF HEAT
CURING
 The development of strength of concrete is a
function of not only time but also
temperature.
 When concrete is subjected to higher
temperature it accelerates the hydration
process resulting in faster development of
strength . concrete cannot be subjected to
dry heat to accelerate the hydration process
as presence of moisture is also essential in
concrete .

10. TYPES OF HEATING CURING
 STEAM CURING AT ORDINARY PRESSURE
 STEAM CURING AT HIGH PRESSURE
 CURING BY INFRA-RED RADIATION
 ELECTRICAL CURING

11. STEAM CURING AT ORDINARY
PRESSURE
 This method is often adopted by prefabricated
concrete elements. Application of steam curing to
in situ construction will be a difficult task. However
at some places it has been useful with thehelp of
thick polyethylene sheets. But the rate of
development of strength is not beneficial

12. HIGH PRESSURE STEAM CURING
 In the steam curing at atmospheric
pressure the temperature of steam is
naturally below 100 C. the steam will get
converted in to water,thus it can be
called in any way , as hot water curing .
this is done in open atmosphere

13. DURATION OF CURING
 The concrete should not be allowed to dry
fast in any conditions. This conditions should be
maintained for 24 hours. The best practice is to
keep the concrete in gunny bags for 24 hours
and then commence water curing by ponding
or sprinkling method. The concrete cured for
the long time will show superior strength and
show other good properties. However ,curing
for long time will be a costlier process. The
curing period varies for different structures
,situation and different atmospheric
temperature. So for general it is cured for 7 days

14. CONCLUSION
 It is false economy to neglect the correct curing
program for all concrete items produced either on site or
in factory processes.
 2- Most pre-cast concrete producers employ some
sort of curing system that is appropriate to their
production regime.
 3- Most reinforced concrete constructors pay scant
regard to this critical step in realising the full potential of
a ‘designed’ concrete and therefore compromise the
design of the structure under construction.
 It is a fairly simple exercise to determine the correct
selection of curing system needed for a particular
application. However, it is a far easier selection to
choose to cure a concrete structure or not.
 CURED CONCRETE QUALITY CONCRETE