Methods used for Curing of Concrete
Concrete needs to be cured. There are many different methods of curing. The selection of a specific method will rely on the idea of work and the climatic conditions. The accompanying methods of curing of concrete are commonly embraced.
1. Shading concrete work
2. Covering concrete surfaces with hessian or gunny sacks Sprinkling of water
3. Ponding method
4. Membrane curing
5. Steam curing
Shading concrete work
The object of shading concrete work is to keep the vanishing of water from the surface even before setting. This is embraced for the most part in the event of huge concrete surfaces, for example, street sections.
This is basic in dry climates to shield the concrete from heat, direct sun beams and wind. It likewise shields the surface from downpour. In chilly climate shading helps in protecting the warmth of hydration of concrete in this way forestalling freezing of concrete under mellow ice conditions. Shading might be accomplished by utilizing canvas extended on outlines. This method has a restricted application in particular.
Covering concrete surfaces with hessian or gunny sacks
This is a broadly utilized method of curing, especially for basic concrete. In this way the uncovered surface of concrete is kept from drying out by covering it with hessian, canvas or void concrete packs. The covering over vertical and inclined surfaces ought to be made sure about appropriately. These are intermittently wetted.
The time period will rely on the pace of dissipation of water. It ought to be guaranteed that the surface of concrete isn't permitted to dry in any event, for a brief timeframe during the curing time frame. Uncommon game plans for keeping the surface wet must be made at evenings and on vacations.
Sprinkling of water
Sprinkling of water ceaselessly on the concrete surface gives a proficient curing. It is generally utilized for curing floor chunks. The concrete ought to be permitted to set adequately before sprinkling is begun. The shower can be acquired from a punctured plastic box. On little occupations sprinkling of water might be finished by hand.
Vertical and inclined surfaces can be kept constantly wet by sprinkling water on top surfaces and permitting it to run down between the structures and the concrete. For this method of curing the water prerequisite is higher.
This is the best method of curing. It is reasonable for curing level surfaces, for example, floors, rooftop sections, street and landing strip asphalts. The level top surfaces of bars can likewise be pounded. In the wake of setting the concrete, its uncovered surface is first secured with sodden hessian or canvas. Following 24 hours, these spreads are evacuated and little ponds of mud or sand are worked across and along the asphalts.
The region is therefore partitioned into various square shapes. The water is filled between the ponds. The filling of water in these ponds is done twice or threefold per day, contingent on the climatic conditions. In spite of the fact that this method is extremely effective, the water necessity is exceptionally overwhelming. Ponds effectively break and water streams out. In the wake of curing it is hard to clean the dirt.
The method of curing portrayed above goes under the class of damp curing. Another method of curing is to cover the wetted concrete surface by a layer of water evidence material, which stays in touch with the concrete surface for seven days. This method of curing is named as membrane curing.
A membrane will keep the dissipation of water from the concrete. The membrane can be either in strong or fluid structure. They are otherwise called fixing mixes. Bituminised water confirmation papers, wax emulsions, bitumen emulsions and plastic movies are the regular kinds of membrane utilized.
At whatever point bitumen is applied over the surface for curing, it ought to be done simply following 24 hours curing with gunny sacks. The surface is permitted to dry out with the goal that free water isn't noticeable and afterward the fluid black-top showered all through. The dampness in the concrete is along these lines saved. It is very enough for curing.
This method of curing needn't bother with steady oversight. It is received with advantage at places where water isn't accessible in an adequate amount for wet curing. This method of curing isn't productive as contrasted and wet curing since the pace of hydration is less. Besides the quality of concrete relieved by any membrane is not exactly the concrete which is wet restored. At the point when membrane is harmed the curing is gravely influenced.
Steam curing and boiling water curing is in some cases embraced. With these methods of curing, the quality improvement of concrete is exceptionally fast. These methods can best be utilized in pre-thrown concrete work.
In steam curing the temperature of steam ought to be limited to a limit of 75C as without legitimate stickiness (about 90%) the concrete may dry too early. If there should arise an occurrence of heated water curing, temperature might be raised as far as possible, say 100C.
At this temperature, the advancement of solidarity is about 70% of 28 days quality following 4 to 5 hours. In the two cases, the temperature ought to be completely controlled to maintain a strategic distance from non-consistency. The concrete ought to be kept from quick drying and cooling which would shape breaks.