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| STUDY ON THE ALTERNATING CURRENT IMPEDANCE SPECTRA OF POLYMER COATED MORTAR SPECIMENS |
| Shiyun Zhong;Meilun Shi;Zhiyuan Chen |
| 同济大学混凝土材料研究国家重点实验室 |
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Abstract Polymeric coatings are widely used materials for re pairing of steel bar reinforced concrete.In this paper,the influence of coatings on the permeability was studied with the alternating current impedance spectros copy.Two types of polymer coatings (styrene-butadiene rubber latex (SBR)and chl orinated polyvinyl chloride solution (CPVC))were used.The test results showed t hat the alternating current impedance spectra (ACIS)of the polymer coated morta r specimens had a semi-circle in the high frequency range,and the diameter of th e semi-circle indicated the permeability of the coatings.It was also found that the thickness of coatings had different influence on the ACIS depending on the t ype of coating.The comparison of the ACIS of the coated mortar specimens before and after chloride migration test demonstrated that the SBR was suitable for rep airing because the resistance of the coating increased after migration test.Howe ver,the CPVC was not suitable for repairing because the resistance of the coatin g was enormously reduced after migration test.
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Received: 04 September 2001
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Corresponding Authors:
Shiyun Zhong
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