Microscopic Observation of Sites and Forms of Ettringite in the Microstructure of Deteriorated Concrete

Ando, Yoko; Hirono, Shinichi; Katayama, Tetsuya; Torii, Kazuyuki

doi:10.14250/cement.72.255

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2020

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“…It is known that ettringite can form within ASR-induced cracks in concrete. Ettringite formed in that way is thought not to influence expansion [7]. However, with concrete that has been subjected to high temperatures, the formation of ASR gel and the resultant reduction in pH of pore solution can induce DEF-induced expansion.…”

Section: Introductionmentioning

confidence: 99%

<b>Effect of Alkali-silica Reaction on Delayed Ettringite Formation in Concrete</b>

2020

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We investigated the effects of alkali-silica reaction (ASR) on delayed ettringite formation (DEF) using mortar test pieces comprising ASR reactive aggregates with added potassium sulfate under various environmental conditions. As a result, it was observed that ASR not only promotes expansion caused by DEF, it causes the expansion to occur prematurely, even under conditions where the amount of sulfate and water supply are not significantly large. The increased DEF expansion could be attributed to microcracks accompanying the progress of ASR at high temperatures, and the decrease in the cured product's pH owing to the consumption of an alkaline component during ASR. However, the final expansion caused by DEF tended to be less in mortars where ASR had occurred.

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Section: Introductionmentioning

confidence: 99%