| Title |
The Influence of Type and Concentration of Organic Additives on Material Properties of Sand Coat Wall |
| Authors |
이다희(Lee, Da-Hee) ; 권양희(Kwon, Yang-hee) |
| DOI |
https://doi.org/10.5659/JAIK.2022.38.9.287 |
| Keywords |
Organic additives; Cultural property repair standard product count; Traditional wall; Sand coat wall; Plastering work |
| 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. |