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CHLORIDE PERMEABILITY TEST ON CONCRETE |
Linhua Jiang |
河海大学材料科学与工程系 |
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Abstract Three methods for measuring the chloride ion permeability were used,a nd the corresponding results were compared.The methods used were chloride perme ability test (AASHTO T227 and ASTM C1202),steady-state migration test and condu ctivity test.The concrete used in this paper included the control Portland ceme nt concrete,lightweight concrete and the concrete containing fly ash,slag,sil ica fume,metakaolin and rice husk ash.Test results indicate that the resistanc e of concrete to chloride ion penetration increases with the decrease of water-c ement ratio.Fly ash and slag can increase the resistance of concrete to chlorid e ion penetration,and silica fume,metakaolin,rice husk ash and some content s lag can increase significantly the resistance of concrete to chloride ion penetr ation.There is not a good linear relationship between the charge passed and ini tial current in the whole charge range.Three tests lead to a similar conclusion regarding the relative qualities of concretes.ASTM C1202 still can be used in many cases,and the conductivity test method appears to be better suited to the chloride permeability test.
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Received: 29 June 2001
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Corresponding Authors:
Linhua Jiang
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