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Yamada T.,Japan Paint Inspection and Testing Association | Tsukuda Y.,Japan Paint Inspection and Testing Association | Yamamoto T.,Kyoto University | Kunieda M.,Nagoya University | Miyagawa T.,Kyoto University
Zairyo/Journal of the Society of Materials Science, Japan | Year: 2012

Various repair methods have been recently applied to not a few concrete structures which had been degraded, in order to prolong the service life of infrastructures. In the Subcommittee on Polymers for Repair and Strengthening (in Concrete Structures) organized in Committee on Polymers in Concrete (Chair: Toyoaki Miyagawa) of the Society of Materials Science, Japan (ISMS), the systematic experiment with the common test procedure on the concrete surface coating systems/materials has been carried out since 2006, in order to propose a common test method which is available to the actual proof and the comprehensive evaluation of the durability of the concrete structures repaired with the concrete surface coating material. In this study, the common test method was focused on the bond performance which has a great influence on the durability of concrete surface coating system. The bond test methods which were able to evaluate the peeling behavior were performed in addition to the popular bond test using uni-axial tension, which often resulted in the similar bond strength due to the fracture of the substrate. The common test results on the concrete surface coating system using both the uni-axial tensile and peeling bond test brought more practical and accurate evaluation for the bond performance of coating films. © 2012 The Society of Materials Science. Source


Yamada T.,Japan Paint Inspection and Testing Association | Tsukuda Y.,Japan Paint Inspection and Testing Association | Yamamoto T.,Kyoto University | Kunieda M.,Nagoya University | Miyagawa T.,Kyoto University
Zairyo/Journal of the Society of Materials Science, Japan | Year: 2013

In these days, many repair examples of the concrete structure have been reported and the durability of concrete structure is taken up as an important issue. Outdoor exposure test is the most practical way to evaluate the durability of surface coating material on the concrete structure but it requires long time to complete. Therefore it is also a big issue to propose an accelerated weathering test to shorten the time for evaluation. The Subcommittee on Polymers for Repairing and Strengthening Concrete Structures under the Committee on Polymers in Concrete (Chair: Toyoaki Miyagawa) within the Society of Materials Science Japan (JSMS), has conducted common tests on the surface coating materials since 2006. The purposes of common tests are to propose common test procedures which enable comprehensively to evaluate the durability of the surface coating material on concrete. Furthermore the Subcommittee carried out another two weathering tests (accelerated) in the secondary part of the common test to obtain the durability of surface coating material in short time. As a result of investigation on adhesion performance focusing on the relationship between the actual outdoor exposure test and the accelerated weathering tests, it was concluded that an accelerated weathering test was effective for some of the coating systems. © 2013 The Society of Materials Science, Japan. Source


Yamada T.,Japan Paint Inspection and Testing Association | Tsukuda Y.,Japan Paint Inspection and Testing Association | Katsui K.,Japan Paint Inspection and Testing Association | Watanabe Y.,West Japan Railway Company | Miyagawa T.,Kyoto University
Zairyo/Journal of the Society of Materials Science, Japan | Year: 2011

In recent years when the quality of many concrete structures is progressively deteriorating due to carbonation, chloride damage, etc., various repair methods are being applied to prolong the life of public structures. Among these methods, the concrete surface coating method, where a material is applied over the surface to prevent substances from invading and deteriorating the concrete, has a long history, more than a quarter of a century. Many new protection techniques based on this method are being proposed even today. On the other hand, the adhesive ability of the concrete surface coating method has been one of the most important evaluation items for measuring the durability of coatings, and the measurement of adhesive strength in the single vertical axial direction has been mainly used for this evaluation. However, this test method has difficulties meeting our original purpose of comparing the adhesion performance between samples, because the test tends to often produce the same result: substrate destruction. Taking the above circumstances into account, another evaluation method that images the peeling-off of the coating films, i.e., the peel-off resistance measurement, was introduced. This method enabled us to observe clear differences between samples where the concrete substrates had been damaged by the adhesion strength measurement. In addition, some of the concrete surface coating methods showed a phenomenon that appeared at the peeled-off or damaged part of samples and varied in quality over time. From a series of concrete surface coating tests using both evaluation methods, we drew the conclusion that we could make clear the adhesion of coating films in a more practical and accurate way. © 2011 The Society of Materials Science, Japan. Source

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