Abstract
This study was performed to investigate the water repellent effectiveness of natural oil-applied soil when it is used as a building material. Natural oil types such as olive oil, bean oil, perilla oil and linseed oil, which are being used for producing water repellent timber, are selected for the experiments. It is expected that perilla oil and in seed oil, which are drying oil types will have better water repellent effectiveness than the other types. For the evaluation of water repellence of natural oil-applied soil, a contact angle test was performed. A contact angle of water drop on various surface conditions were tested, and large differences were seen between the natural oil-applied soil and untreated soil. As a result, it is showed that all natural oil types have water repellent effectiveness. However, linseed oil, which is a drying oil type, shows an outstanding water repellent effectiveness value, while perila oil, which is also a drying oil type, shows the lowest value. Additionally, results show that there is no link between water repellent effectiveness and the number of applications of natural oil. Nevertheless, existing commercial water repellents show better performance than natural oil, and it is anticipated that the results of this study will provide essential information for further research to enhance the water repellent effectiveness of soil as a building material.
Highlights
Construction industry has been blamed for environmental pollution and massive energy consumption
The results show that contact angle of 3 times application was lower than 2 times, and the difference was 4.22 ̊ as shown in the chart below (Figure 8). 4) Specimens with drying oil types In the test of specimens with drying oil types, both perilla oil and linseed oil were used
The selected natural oil types are all available on the market and classified according to the iodine value
Summary
Construction industry has been blamed for environmental pollution and massive energy consumption. In Korea, Hwangtoh, literally meaning yellow soil in Korean, has been widely used in traditional architecture for thousands of years. Korean traditional architectures mostly are wood frame buildings, and Hwangtoh is used to build a solid wall between wood columns as an infill material (Figure 1 & Figure 2). Soil does not pollute the environment; on the other hand, it ensures the strength of structures and it is readily available in the vicinity. Soil as a building material is difficult to insulate and clad with other materials, and it loses strength when exposed to water. For these reasons, soil needs to overcome several weak points to become a typical building material for modern architecture. A variety of experiments, which are used to enhance water repellent capacity of timber, will be conducted on soil, and the results will show the best practical method to improve water repellent effectiveness of soil as a building material
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