Effects of Soak Solution Type on Alkali Release from Volcanic Aggregates ? Is Alkali Release Really Responsible for Accelerating ASR Expansion? ?

Yuichiro Kawabata, Kazuo Yamada, Go Igarashi, Yasutaka Sagawa

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Alkali release from aggregates is considered to cause expansion due to the alkali-silica reaction (ASR), owing to the increase in the hydroxide ion concentration (namely pH) of the pore solution. However, a direct validation of this assertion has not yet been made. In this research, the effects of the type of soak solution, which might better mimic the composition of the pore solution, on the behavior of alkali release from aggregates are investigated through immersion tests of aggregates. More importantly, accompanying ions dissolved from the aggregates are also measured in order to determine the mechanism for the increase in hydroxide ion concentration of the pore solution. The test results show that this increase can barely be observed, despite a considerable amount of alkalis being released. The results critically question the conventional view that alkali released from an aggregate serves to accelerate the ASR.

Original languageEnglish
Pages (from-to)61-74
Number of pages14
JournalJournal of Advanced Concrete Technology
Volume16
Issue number1
DOIs
Publication statusPublished - Jan 2018

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Materials Science(all)

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