The phenomenon known as the exudation of the concrete occurs in fresh concrete by the rise of the mixing water and depends, among other things, the fine that is the used cement. Materials containing concrete to be poured have different densities and there is a tendency to the decanting of the heavier aggregates and a rise in the less dense water. The exudation of concrete is a form of segregation of its components where water tends to rise toward the surface of the concrete to the not being able to drag it aggregates with them when leaving compacting. Water, to Ascend, creates a thin, weak and porous layer that has no resistance and is durable in the concrete surface. The water that reaches the surface usually evaporates in a slow way, but if evaporation is faster than the speed of their migration from the interior to the surface of plastic shrinkage cracks are created by afogarado. The loss of water by exudation has a positive side which is the reduce the ratio water/cement concrete with a favourable impact on the heating elements. However, when migrating from the interior is creating a series of capillaries that subtracted impermeability to concrete and ducts that do little durable, especially against frost. To ascend the water drags with it cement forming a thin grout to dry creates a weak film to be removed provided that you have to stick this concrete with another or with other materials using adhesives. tId%3A2687503%2CVSRPcmpt%3Aprimary’>Karen Edwards. Original author and source of the article

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