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MADE BY : RUSHABH H SHAH ROLL NO: 852 DISP : SYCS TOPIC : CURING OF CONCRETE
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
METHODS OFCURINGWATER CURINGAPPPLICATION OF HEATMEMBRANE CURINGMISCELLANEOUS
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
TYPES OF WATER CUING IMMERSION PONDING SPRAYINGOR FOGGING WET COVERING
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
APPLICATION OF HEATCURING 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 .
TYPES OF HEATING CURING STEAM CURING AT ORDINARY PRESSURE STEAM CURING AT HIGH PRESSURE CURING BY INFRA-RED RADIATION ELECTRICAL CURING
STEAM CURING AT ORDINARYPRESSURE 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
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
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
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