In order to avoid damage resulting from alkali-silica reactions (ASR) the alkali reactivity of aggregates or concrete compositions must be known so that, if necessary, appropriate measures can be taken. Tests on the alkali reactivity of aggregates can be carried out in accordance with the Alkali Guidelines stipulated by the German Committee for Structural Concrete (DAfStb) or according to RILEM. In cases where the Alkali Guidelines stipulate the substitution of the aggregate or the use of cement with low effective alkali content (NA-cement acc. to DIN 1164-10) the alkali reactivity of a concrete composition can also be proved by an ASR performance test to ensure that aggregates or cements are not unnecessarily excluded from use.
In the case of concrete road pavements (e.g. on airfields or motorways) the ASR damage potential caused by alkalis from de-icing agents, which can intrude from outside into the concrete, is particularly high. Therefore, the General Circular on Road Construction (ARS) No. 04/2013 issued by the Federal Ministry for Transport, Building and Urban Development (BMVBS) stipulates requirements for concrete road pavements that should reliably prevent concrete roads from being damaged by ASR. According to the ARS No. 04/2013 the non-alkali-reactivity potential of coarse aggregates and concrete compositions of the moisture class WS has to be proven. The Research Institute is acknowledged as an ASR-expert by the Federal Ministry for Transport, Building and Urban Development (BMVBS) respectively the Federal Highway Research Institute (BASt).