If the fair-faced concrete is not maintained properly, the surface is very easy to appear micro-cracks due to water loss, which affects the appearance quality and durability.Therefore, the exposed concrete surface should be covered with sticky film or spray curing film in a timely manner. It is necessary to carry out moisturizing curing, and the problem most likely to occur in unprotected concrete buildings.

A. the color becomes darker after the rain penetrates

Fair-faced concrete building can be seen everywhere in life, the most common is municipal road facilities, such as Bridges, subgrade, road isolation pier.What gives people the deepest impression is this form of architecture in the rain and just after the rain, the surface of the wet, some will have the feeling of being polluted.This is because concrete is a porous material, the surface water absorption rate is very large, easy to absorb water, but also easy to absorb dirt, water absorption concrete surface color will become dark.

B. concrete strength will be affected by long-term exposure to air

Concrete is an alkaline substance. Only by maintaining this alkalinity can the strength and durability of concrete be maintained.And the word that concrete is bare in nature, can get rain water, ultraviolet ray, oiled wait for erode, normally rainwater is weak acidity, can make concrete loses alkalescent gradually, neuterization with each passing day, long, concrete can loosen, lose intensity, shorten service life thereby.At the same time, the rain will gradually infiltrate corrosion of steel, concrete surface will often appear rust spots, affect the appearance.

C. appearance effect of concrete cannot be guaranteed

Concrete pouring process is a longer process, the installation of the template for manual manual work, the level of operation and consciousness of the workers is very high, in addition, some engineering experience several seasons, winter may add concrete admixture, resulting in inconsistent color;Therefore, it is difficult to guarantee that every piece of concrete can achieve the perfect degree of color uniformity.The common problems are cold joints, color difference, pitted surface, honeycomb and other defects, which need to be processed later, otherwise it will affect the overall appearance of the building.

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