Materials reacting aggressively with water

Materials That React Aggressively with Water (Based on King 1990)... 

Phenomena. In the first step, one could clearly look at aggressive effects - the well-known phenomena of acidic and basic solutions. Concerning acids, one can demonstrate the spectacular reaction of concentrated sulfuric acid with sugar (see E7.1) or that of the behavior of acidic solutions with metals (see E7.2). One should discuss, in both cases, the statement that an acid is something which eats material away [5], and can demonstrate that other substances are produced by those acid reactions sulfuric acid and sugar produce black carbon and steam metals react to produce hydrogen and a salt solution, from which solid white salts may be obtained by the evaporation of water. In addition, acidic household cleaners like those that remove lime deposits could be introduced one could demonstrates that when lime deposit is removed by a cleaner solution, salt solution and carbon dioxide gas are produced (see E7.3). 

In fact inorganic carbon contained in water can react with the material to form calcium carbonate (CaCOs ) on the surface of the material (carbonation), thus closing the pores of the cement matrix. If TIC is not sufficient for that, no carbonation of the surface occurs and migration of some elements (Ca, K) continues or m be increased. Also if the water is aggressive to calcium carbonate, the deposit is not stabilized and continued migration from the material occurs. 

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