Studies of alkali-silica reaction — part I a comparison of two accelerated test methods

✍ Scribed by A. Damgaard Jensen; S. Chatterji; P. Christensen; N. Thaulow; H. Gudmundsson

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 405 KB
• Volume: 12
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(82)90026-6

✦ Synopsis

The alkali-sillca reactivity of 35 different sand types have been evaluated by both the "German" and NaCl bath methods. The results show that although there is a general correlation between the results of these two methods, the evaluations of sand by the two methods are not identical. Analyses of the procedures show the reasons and indicate that the salt bath method is preferable.

The results also indicate that the use of a low alkali cement in conjunction with a reactive aggregate may not protect a concrete sample if sodium salts, from an outside source, can migrate and concentrate in it.

RESUME

Alkalikiselreaktiviteten af 35 forskellige sandtype er malt sAvel med den "tyske" metode som med NaCl-metoden. Resultaterne riser, at sk~nt der er en generel korrelation mellem resultaterne af de to metoder, er vurderingen af et givet sand ikke identisk. Analyse af procedurerne viser Arsagerne og viser, at NaCl-metoden b~r fo-retr~kkes.

Resultaterne antyder ogsA, at brug af lav-alkalicement i forbindelse med et reaktivt tilslag ikke vil beskytte betonen, sAfremt alkalisalte udefra kan trange ind oq koncentreres.