The fresh concrete (and also the mortar) contains a certain amount of water. This water is necessary to obtain good workability in the fresh state. Under normal maturation conditions, once the concrete has been poured, part of the water is gradually consumed by the chemical reactions of hydration of the cement grains. It is these reactions which lead to the setting and progressive hardening of the concrete / mortar. The excess water contained in the concrete will gradually evaporate through natural drying.
Once implemented, you should know that concrete or mortar during the setting phase and the first hours or even the first days of its life (what is called young age) is very vulnerable.
Indeed, during this period of setting and beginning of hardening of the concrete, and particularly when the atmospheric conditions are unfavorable (high temperature, wind, sun, dry air), it is necessary to prevent the water in the concrete from seeping. Evaporates too quickly before having been able to hydrate all of the cement grains. This is so that the hydration is optimal and that the increase in resistance is done in good conditions.
Curing concrete is essential, indoors and outdoors, even in cold weather. It must be implemented as soon as possible after the placement of the concrete and even at the advancement in the case of large surfaces (greater than 100 m2). It must be maintained until the concrete has acquired sufficient maturity.
The cure is carried out:
Either by limiting evaporation;
Or by adding water with wax emulsion Selangor to the concrete surface.
It is particularly necessary for horizontal surfaces (case of ready-mixed concrete for pavings, slabs, screeds) which have a large evaporation surface.
How to cure your concrete?
The cure consists in applying as soon as the concrete is placed, depending on the type of structure, the following methods:
For formwork or molded concrete elements (eg: wall, outrigger, column, beam, etc.): keep the formwork in place.
For horizontal structures (e.g. Paving, concrete slab, screed):
The curing product must be applied after departure of the penetrant water using a dedicated sprayer. It will form a waterproof film which will oppose the evaporation of water and protect the concrete / mortar from desiccation for several days. The curing product will gradually be eliminated under the action of traffic and / or atmospheric agents. In the event of subsequent application of coating, plaster, screed or paint on the surface of the work, the curing product must be removed mechanically (sanding or sand) or by high pressure water jet to ensure good hangs on.
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