Some of the aggregates used today contain alkali-reactive silicic acid. This can react with the alkali hydroxide dissolved in the concrete pore water to form an alkali-silicic acid gel. This reaction is called the 'alkali-silica reaction' (ASR) and can lead under certain circumstances to massive damage to the concrete. The introduction of the new Alkali Directive  by the building authorities and the new DIN 1045 2  has resulted in far-reaching consequences throughout Germany, not only for the manufacturers of aggregates and concretes, but also for the planners of buildings constructed from concrete and steel reinforced concrete.
Materialprüfungs- und Versuchsanstalt Neuwied
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