Reproduction of delayed ettringite formation in concrete and its mechanism

Title: Reproduction of delayed ettringite formation in concrete and its mechanism
Author(s): S. Hanehara, T. Oyamada, T. Fujiwara
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 143 - 152
Total Pages: 10
Nb references: 8
Language: English

Abstract: The influence of constituents of concrete including a sulfate addition, on the expansion of concrete by delayed ettringite formation (DEF) is investigated in order to clarify the DEF mechanism. Six types of mortar were prepared, with high early strength Portland cement, with white Portland cement which expands by more than 2.0%, with ordinary Portland cement which expands by 0.6%, and with moderate heat Portland cement, fly ash blended cement class B and blast furnace slag cement class B which do not expand. The influence of the kind of aggregate is remarkable. Mortar made with quartz aggregate and ASR reactive aggregate also exhibit great expansion during the first few days. The influence of limestone aggregate on expansion however is small compared to DEF. There exists a correlation between the free sulfate ion eluted from hardened concrete and the expansion volume of its mortar. A method for measuring these ions is useful in prediction of DEF.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00

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