Assessing the Durability of Concrete Regarding ASR


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Title: Assessing the Durability of Concrete Regarding ASR

Author(s): J. Stark and C. Giebson

Publication: Special Publication

Volume: 234


Appears on pages(s): 225-238

Keywords: alkali-silica reaction (ASR); durability; performance-test; slow/late aggregates

Date: 3/22/2006

The alkali-silica reaction (ASR) was recognized by Stanton in 1940 and is still today a world-wide problem. The basic reaction mechanisms are reasonably well understood and in many cases a prevention of the ASR is possible. However, there are still severe damages on concrete structures caused by alkali-silica reaction, especially related to slow/late aggregates. This paper presents the experiences with the German Alkali-Guideline during the past decades in Germany and introduces latest approaches in developing forward-looking test methods to assess the durability of concrete regarding ASR due to alkali-reactive slow/late aggregates. The emphasis is particularly placed on assessing the influence of an external alkali supply, i.e. the impact of de-icing solutions, on pavement concretes. For this purpose the cyclic climate storage was used and proved as appropriate method.