Preventive measures against concrete damage to ASR in the Netherlands current state-of-affairs
In CUR-Recommendation 38, various vital measures that need to be taken during design of new concrete-mixtures in order to prevent damage due to ASR in the concrete have been outlined. The most important of these measures are: - the use of blast furnace slag cement (with a high slag content: ≥50% by mass of cement as slag); - or the use of portland fly ash cement (containing at least 25% by mass of cement as fly ash). If one of these cement types is used, then the potential reactivity of the aggregates is assumed to be of no concern. These measures were cautiously adopted on the basis of several years of experience with the performance of these cements, especially blast furnace slag cement. Although, to date, no cases of damage due to ASR have been found in concrete structures prepared with such cements, various questions have been raised recently as to whether these measures are adequate enough, especially in cases such as large infrastructures. This paper is intended to throw more light onto the current state-of-affairs concerning these measures with a view to answering the most commonly asked questions.
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Delft Univ of Technology, Delft, Netherlands
Heron, 44 (44), 285-298
7th Euroseminar on Microscopy Applied to Building Materials, Delft University of Technology, Delft, The Netherlands, June 29-July 2