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10th Canadian Masonry SymposiumResearch

EXPERIMENTAL STUDY ON FOLLOWING PERFORMANCES OF REPAIRED FINISH COATS TO CLAY BRICK MASONRY ASSEMBLAGES

R. Kawahara1, A. Baba2, A. Mori3 and T. Dainobu4

  1. Assistant Professor, Dept of Perceptual Design and Engineering, Yamaguchi University, M. Eng., kawa@yamaguchi-u.ac.jp
  2. Professor, Dept of Perceptual Design and Engineering, Yamaguchi University, Dr. Eng., baba@yamaguchi-u.ac.jp
  3. Professor, Tsukuri College, Graduate School of Engineering, Nagoya Institute of Technology, Dr. Eng., mori@archi.ace.nitech.ac.jp
  4. Doctoral Student, Division of Design Engineering, Yamaguchi University, Tomikazu_Dainobu@taiheiyo-cement.co.jp

ABSTRACT

This study deals with an evaluation of the deformational performance of repair finishing coats, as applied to clay brick masonry assemblages for long time preservation of historical brick masonry structures, in response to differential movement (we will refer to this as the ‘following performance’ of a material).

These clay brick masonry assemblages have wet finishing coats repaired with several kinds of repair materials. For finishing, a lime cement mortar finishing coat and a plaster finishing coat were selected. These are general wet finishing methods used to repair historical brick masonry buildings in Japan. For repair materials, 10 kinds of injection and penetration materials were selected in order to analyze the performance of the repair materials currently used in cultural assets preservation. Furthermore, the construction efficiency of these repair materials and the aesthetic effect after construction were reviewed.

This examination revealed that almost all repair materials improved the adhesiveness and following performance of finishing coats compared with specimens that received no repair. In several repair materials, the following phenomena were observed. 1) The adhesion layer absorbed the deformational energy of masonry prisms and didn’t transmit uniaxial strain to the surface of finishing coat. 2) Some of repair materials failed to produce better adhesiveness because of poor construction. 3) Some of repair materials spoiled the aesthetics of the specimen because of leaked repair material.

KEYWORDS: cultural assets, finishing coat, following performance, injection, penetration

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