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Caveat:  I am not a Materials Engineer.

From here:

Concrete is a mixture of a binding agent (generally cement) to bond the other materials together :, fine aggregate (sand), coarse aggregate ( gravel/stones ), and water..  A typical composition is about 7-15% cement, 14-21% water and the rest aggregate.

Water Resistant Concrete    

    * Water Resistant concrete can either be water proofed or watertight. Waterproofed concrete is formed with a water resistant layer or surface whilst the mass of concrete being ordinary concrete. The water tight layer can be formed using a spray of lacquer, or applying a coat of asphalt or bitumen or using a wash of soda (water glass)
    * A watertight concrete can be produced by ensuring and dense product using tight quality control of the production process. The concrete so formed can be sufficiently water-tight to enable use for tanks retaining water

High density Concrete    

High density concrete for use as nuclear shield walls and ballast blocks and sea walls can be produced by using different materials for the aggregate.  Candidate materials include barytes, haematite, iron shot, steel shot and lead shot.

I can't find any information stating the concrete composition and construction of the buildings housing the reactors.  It is uncertain if the floor of the building was constructed with high density concrete or with low density concrete with a surface application to make it water tight.    

She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre

by ATinNM on Sun Apr 3rd, 2011 at 01:03:31 PM EST
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