Talk:Alkali–silica reaction

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Examples of ASR[edit]

It seems inappropriate to single out the Los Angeles 6th St Viaduct as an example, unless you intend to comprehensively list the many thousands of US structures affected by ASR. An better alternative would be to provide an anonymous picture of typical ASR attack. . . .LinguisticDemographer 14:13, 11 August 2007 (UTC)

Raleigh,NC ripping up 8 lanes, 2 feet thick, 11 miles; after 11 years of service.~ — Preceding unsigned comment added by Wikipietime (talkcontribs) 02:39, 20 March 2013 (UTC)

Merge proposal[edit]

I think that Alkali Silica Reaction and Alkali-aggregate reaction are essentially the same thing and propose that the latter be merged and changed to a redirect to here. –Moondyne 01:57, 9 December 2008 (UTC) Not true.. ACR and ASR are branches of AAR —Preceding unsigned comment added by 142.151.178.65 (talk) 02:39, 14 December 2008 (UTC)

They are not the same thing. Alkali-aggregate reaction is the umbrella term for a few types of reaction. So should not merge. —Preceding unsigned comment added by 82.38.179.224 (talk) 17:28, 17 January 2009 (UTC)

I agree that the two should be merged. However, the final article should be Alkali Aggregate Reaction, with Alkali Silica Reaction being a sub-heading, along with Alkali Carbonate Reaction and Alkali Silicate Reaction, etc. All should redirect to AAR. This is how they are conceived and discussed in the Civil Engineering community. Garbagemania (talk) 02:31, 30 January 2009 (UTC)

I agree with the immediate above. Alkali-Silica, Alkali-Silicate and Alkali-Carbonate Reactions are all sub-headings for Alkali Aggregate Reactions and each should be discussed under a unified AAR heading —Preceding unsigned comment added by 57.66.53.93 (talk) 14:22, 11 March 2009 (UTC)

Definition issues[edit]

Editors and experts . . . I feel like the first few lines of an article should give a clear and concise definition of the topic. As such, I'm wanting to edit the first line to be more like this:

Alkali-Silica Reaction (ASR) is a reaction which occurs in portland cement concrete between reactive (amorphous) silica (in concrete aggregates) and an alkali (usually present in the cement), which results in the formation of a gel.

Would these edits be wrong? Am I making it too specific/exclusive?

Please advise. Thanks. Garbagemania (talk) 03:40, 30 January 2009 (UTC)

Well, the reaction could happen from sodium and potassium at the same time. The formation of the gel is only the prelude to degradation: it expands in contact with water. The mechanism of the reaction as described in the article is actually controversial: there are reported cases of reaction throughout the aggregate with gel pockets forming.
ASR can also happen in bitumen (and I suspect in CACs also): it is fundamentally about the aggregates. Cement provides an alkaline environment, but the alkalis could come from an external source.CyrilleDunant (talk) 14:21, 5 February 2009 (UTC)