This is the result of the study on the temporary fortifier using sublimation type Consolidate is Cyclododecane to prepare plan for reinforcement of the surface part that can be damaged during the dismantling of stone cultural heritages. To supplement the disadvantages of the existing reinforcement methods using intumescent urethane foam, Cyclododecane was diluted in solvent to reinforce the surface and inside desquamation, and after dismantling the framework, it sublimated by imposing heat of about 60℃. Such method can guarantee the strength needed for reinforcement of the damaged surface with outstanding reversibility of Cyclododecane being entirely sublimated. But, it shows big difference of effect according to the solvent, so it shall be diluted in petroleum ether or heated in a double boiler. Therefore, considering the working conditions at the site, it seems the most appropriate to use petroleum ether double boiler heating method for injection and filling of the desquamation part and temporary reinforcement processing with Cyclododecane diluted in petroleum ether for surface spraying.
Plastic artwork can be appeared crack, change of color and whitening event by various environment conditions. A large scale plastic artwork often exhibits in outside it will be directly degraded by physical and chemical degradation factor such as strong sunlight, high humidity and rainfall. We should know degradation characteristic of plastics to prevent these damages. In this study, we studied degradation characteristic of plastics (5 types of wide use plastics; polypropylene, polystyrene, polyethylene, polyvinyl chloride, polyurethane) depending on various artificial degradation conditions such as high temperature, ultraviolet and these complex conditions (high temperature and ultraviolet). As a result, polypropylene, polystyrene and polyethylene show the most visible change especially polypropylene, polystyrene. Polypropylene didn't show a great change degree of tensile strength and contact angle, on the other hand polystyrene did. Polypropylene and polystyrene weakened by photo degradation, polyvinyl chloride and polyurethane had relatively
This study attempted to apply a hybrid technology that integrated mineral-based fillers and water-repellent agents to control the efflorescence that results from the use of inorganic binders, for the conservation treatment (surface finishing) of cultural heritage materials made up of stone. Herein, different types of mixing ratios of a filler (silica fume 3.4%) and a water repellent (silane-siloxane 1%) were selected for fabricating the inorganic binder, and it was determined that the ratio selected by weight is effective in controlling efflorescence substances. In addition, it was identified that the inorganic binder with the mixing ratio resulted in a higher compressive strength than the standard (20MPa), and the water permeability resistance was high with low water absorption. The result of ion elution from the bilder showed that a smaller number of ions was observed to affect the efflorescence (directly and indirectly) as compared to that of the control group, which was considered to be relatively stable.
The material characteristics and conservation conditions of the Rain Gauge Pedestal of <i>Gyeongsang</i> Provincial Office, <i>Daegu</i>(National Treasure) and the Rain Gauge Pedestal of <i>Gwansanggam</i>, Bureau of Astronomy(Treasure) which have been kept at the Korea Meteorological Administration were scientifically diagnosed, and the conservation treatment for those artifacts was performed. The Rain Gauge Pedestal of <i>Gyeongsang</i> Provincial Office was made of aplite at that time but on the other hand, its bottom stone was made of medium and coarse grained grantite since 1985. The Rain Gauge Pedestal of <i>Gwansanggam</i> was made of medium and coarse grained granite in pale rose color, and based on petrologic material characteristics and characteristic values by magnetic susceptibility measurements, it is presumed to have been made in the late Joseon Dynasty. The main contamination on the surface of the rain gage pedestals is black contaminants which were derived from carbon, and the fiber laser was used to complete the work after dry and wet cleaning were performed. In addition, impurities caused by acrylic colors and paint were removed by the poultice method after the preliminary cleaning. In terms of consolidation as the final stage of the conservation process, the ultrasonic assessment on physical properties before and after consolidation resulted in more than 10% improvement on average. From a perspective of the original form as cultural heritage, the bottom stone of Rain Gauge Pedestal of <i>Gyeongsang</i> Provincial Office has been treated with mortar on the surface and its color was matched during the conservation treatment, which hinders approach to exact information of cultural heritage. Furthermore, with regard to the Rain Gauge Pedestal of <i>Gwansanggam</i>, there is the need to examine whether it served as a pedestal to support the rain gauge(<i>Cheugugi</i>), judging by material characteristics, manufacturing techniques of rain gauge holes and <i>Donggwoldo</i> depicting a rain gauge in the painting. Therefore, the opportunity to establish authenticity of cultural heritage will be required by doing literature research on cultural heritage of traditional science technology, historical research on the original form and natural scientific analysis.
VNIR hyperspectral images can be analyzed in situations involving color changes, such as before and after cleaning, without pre-treatment. In this study, to analyze the application of the VNIR hyperspectral system, we compared the black contaminants on the surface of the Jigwangguksa Pagoda upper stereobate at Beopcheonsa Temple, Wonju before and after cleaning with laser. After a preliminary experiment to evaluate the applicability of VNIR hyperspectral imaging, we took images of the four sides (north, south, east, and west). The 823 nm band image was used for comparing before and after cleaning. As per the result of the image differencing analysis about before and after cleaning, the spectral reflectance of the area where the cleaning was performed showed a tendency to increase. Additionally, it was found that not only the washed area but also the extent of change could be calculated through monochrome for quantitative comparison, and imaging analysis using the VNIR hyperspectral system was sufficiently effective for comparison before and after cleaning.
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