Accelerated sulfate resistance test for concrete-chemical and microstructural aspects

Author(s): A. Leemann, R. Loser
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 743-751
Total Pages: 8
Language: English

The sulfate resistance of concrete was tested with an accelerated method using dryingimmersion cycles in Na₂SO₄ solution. The measured expansion corresponds with the sulfur ingress in the test specimens. The microstructural analysis indicates that the phase conversion from monosulfate/monocarbonate to ettringite is related to the observed expansion. However, the C-S-H of the slag cement system seems to adsorb more sulfur than the C-S-H of the OPC-system possibly reducing the amount of ettringite formed. The sulfur content in the specimens and the mineral assemblage present are similar to the ones found in on-site concrete and specimens used for long-term tests with relatively low concentrated sulfate solution. Therefore, the test method seems to be applicable for assessing the sulfate resistance of concrete.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00