Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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The Influence of Type and Concentration of Organic Additives on Material Properties of Sand Coat Wall

유기 첨가제의 종류 및 농도가 재사벽의 재료특성에 미치는 영향

  • Lee, Da-Hee (Dept. of Traditional Architectural, The Korean National University of Cultural Heritage) ;
  • Kwon, Yang-hee (Dept. of Traditional Architectural, The Korean National University of Cultural Heritage)
  • 이다희 (한국전통문화대학교 전통건축학과) ;
  • 권양희 (한국전통문화대학교 전통건축학과)
  • Received : 2022.06.18
  • Accepted : 2022.08.31
  • Published : 2022.09.30
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Abstract

According to the current specifications of repair for heritage buildings, the sand coat wall should be plastered using organic additives. However, the concentration of these additives that influence the finish and quality of the wall was not specified. The understanding of wall finishing materials is currently low regarding concentration properties and has been too dependent on the experience and the sense of workers in this field. In this study, the influence of material properties of three organic additives such as sticky rice, starch, and seaweed pastes on the finishing layer of traditional walls were investigated. The viscosity of nine paste samples with various concentrations of 4.4%, 8.5%, 12.2% for sticky rice and starch pastes of 4.4%, 8.5%, and 10.3% for seaweed grass were measured. Experiments for mortar samples with these pastes were performed involving workability, surface finishing observation, weight change rate, compressive strength, and thermogravimetric analysis. As a result of this experiment, the mortar samples with grain paste such as sticky rice or starch paste had relatively high workability and cracks did not occur at all concentrations since the paste had a lower viscosity than seaweed paste. On the other hand, in the mortar sample with seaweed paste, cracks occurred in all samples except for the 4.4% sample due to the paste's high viscosity. Based on these obtained results, the risk of cracking was higher when using seaweed paste than sticky rice or starch paste at the same concentration. However, despite the high risk of cracking, the samples containing seaweed showed outstanding strength compared to other samples made evident in the combined effects of the filling of the viscous film in the seaweed paste and the carbonation acceleration. The results of this study are valuable as evidence for determining the appropriate concentration of traditional organic additives when developing or revising specifications.

Keywords

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