It is probably "napowietrzone" - aerated.
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Autoclaved aerated concrete (AAC) is made with fine aggregates, cement, and an expansion agent that causes the fresh mixture to rise like bread dough.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&c...
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Autoclaved aerated concrete (AAC), also known as autoclaved cellular concrete (ACC), autoclaved lightweight concrete (ALC), autoclaved concrete, cellular concrete, porous concrete, Aircrete, Hebel Block, and Ytong is a lightweight, precast, concrete building material invented in the mid-1920s that simultaneously provides structure, insulation, and fire- and mold-resistance. AAC products include blocks, wall panels, floor and roof panels, cladding (facade) panels and lintels.
http://en.wikipedia.org/wiki/Autoclaved_aerated_concrete
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BASF's Micronal® PCM phase change materials have been incorporated into CelBloc Plus aerated cement blocks and gypsum wall board.
http://www.solaripedia.com/713/108/material.html
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Physico-mechanical properties of aerated cement compositescontaining shredded rubber waste. A. Benazzouk, ,; O. Douzane,; K. Mezreb,; M. Quéneudec.
http://www.sciencedirect.com/science/article/pii/S0958946506...

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For example, the amount of air entrained cement composite degassed material can have from about 0% to about 10%, more suitably from about 0.1% to about ...
http://www.google.je/patents/CN102712103A?cl=en

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Air-entrained concrete contains billions of microscopic air cells per cubic foot. These air pockets relieve internal pressure on the concrete by providing tiny ...
http://www.cement.org/cement-concrete-basics/working-with-co...