Water-proofing for concrete: what it is and how to apply?

All of you have probably heard the phrase "aggressive foreign environment" hiding precipitation, temperature changes, the effect of the wind and the sun better. Unfortunately, these factors have a negative impact on such a popular part of the concrete.

Prevent wetting the concrete with water are called special substances - repellents. In other words, substances that make concrete hydrophobic.

In addition to its direct function - moisture protection - repellents indirectly increase the insulating characteristics of the materials, to prevent the appearance of efflorescence, increase the resistance to corrosion of buildings, mold, fungi and lichens.

What are the water repellents?

• Universal (Brand Ceresit, optimistic and AquaPhone).
  Suitable for processing different materials: concrete, brick, natural stone and even paving slabs.
• specialized (Brand Neomid, Neogard, Tiprom M)
  When buying these repellents need to pay attention to the material for which they are suitable: concrete, brick, concrete.
• Water-proofing with the effect of wet stone.
  
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  In contrast to the above two kinds of the water-repellent surface of the material is impregnated her "wet" track.

Interesting fact:
the most powerful water-repellent agents penetrate into the structure of the material is 15-20 mm and not washed away by rain during 7-8 years

By the way, writing this article, I pushed one of the commentators who claimed that: a) the sand absorbs water, and does not pass through it, and b) that the concrete - the eternal building material despite the fact that the exposed moisture. Read the article and comment here.