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 language | English |
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Pages (from-to) | 1091-1097 |
Number of pages | 7 |
Journal | Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society |
Volume | 44 |
Issue number | 8 |
DOIs | |
State | Published - 1 Aug 2016 |
Keywords
- Alkali silica reaction
- Concrete durability
- Cracks
- Delayed ettringite formation
- High performance concrete