Coexistence of alkali silica reaction and delayed ettringite formation in a cracked high performance concrete element

Xiaopeng Kang, Duyou Lu, Zhongzi Xu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The concrete cores drilled from a cracked elements were examined by various testing methods to clarify the cracking of some concrete elements after 4-years in service. The chemical and mineral compositions of the paste in concrete cores were characterized by chemical analysis, X-ray fluorescence, X-ray diffraction and thermogravimetric analysis. The microstructure of the cores was analyzed by the petrographic method and scanning electron microscopy/energy dispersive spectrum. The results show that the amount of fine aggregates and some coarse aggregates show typical signs of the alkali-silica reaction. Ettringites with various morphologies were richly formed in the interfacial transition zone (ITZ) between aggregate and paste. The coexistence of the alkali-silica gel and ettringite also occurs in the ITZ between aggregate and paste. The deterioration of the concrete elements is a typical case caused by the combination of alkali silica reaction and delayed ettringite formation.

Original languageEnglish
Pages (from-to)1091-1097
Number of pages7
JournalKuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society
Volume44
Issue number8
DOIs
StatePublished - 1 Aug 2016

Keywords

  • Alkali silica reaction
  • Concrete durability
  • Cracks
  • Delayed ettringite formation
  • High performance concrete

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