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Pro084-1

MICROSTRUCTURE ANALYSES OF CONCRETE ATTACKED BY WET-DRY CYCLING AND SULFATE SOLUTION



Author(s): Jiang Lei,Niu Ditao,Yuan Lidong
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 194-201
Total Pages: 961
Language : English


Abstract: The experiments of concrete (with addition of 10 mass% fly ash) attack by wet-dry cycling and sulfate solutions were studied in this paper. The corrosion solution includes two types: 10% Na2SO4 and 10% MgSO4 (by mass). Through the experiment, the damage mechanism of concrete was investigated on the basis of the microscopic test. Microobservations included the SEM, XRD and analysis of the chemical products formed using thermal analysis. The experimental results show that under alternate action of wet-dry cycles, concretes are attacked by corrosion products such as ettringite and gypsum during the wetting cycle in both sulfate solutions, and crystallization damage during the drying cycle in the Na2SO4 solution. The gypsum in concrete is less than ettringite in test, and some gypsum is checked only after a certain corrosion age. The corrosion products in the MgSO4 solution are more than those in the Na2SO4 solution. Furthermore, the Ca(OH)2 has been consumed more in the MgSO4 solution, and the deterioration by MgSO4 solution covers more aggressive corrosion on concrete.


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


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