Studies on the alkali-silica reaction rim in a simplified calcium-alkali-silicate system

Kunpeng Zheng, Peter Adriaensens, Geert De Schutter, Guang Ye, Luc Taerwe

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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Abstract

This work is intended to provide a better understanding about the properties and roles of the reaction rim in an alkali-silica reaction. A simplified calcium-alkali-silicate system was created to simulate the multiple interactions among reactive silica, alkaline solution and portlandite near the aggregate surface during the formation and evolution of the reaction rim in an alkali-silica reaction. A transport barrier preventing the migration of calcium and silicate through itself was found on the interface between the alkali silicate and the calcium hydroxide. The barrier was mainly composed of calcium alkali silicate with silicon-oxygen organizations of Q2 and Q3 according to the results of 29Si nuclear magnetic resonance, the calcium to silica mole ratio ranging from 0.22 to 0.53 and the alkali to silica ratio ranging from 0.20 to 0.26 based the location of the elemental compositional analysis and the storage period of the system.

Original languageEnglish
Article number670
Pages (from-to)1-19
Number of pages19
JournalMaterials
Volume9
Issue number8
DOIs
Publication statusPublished - 9 Aug 2016

Keywords

  • Alkali-silica reaction
  • Calcium alkali silicate
  • Reaction rim
  • Transport barrier

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