The Research of The Testing on The Durability of Protective Coating for Traditional Building Material

• Main Authors: Shih Hsu-yuan, 施旭原
• Other Authors: Wang Hui-chun
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/14811113300284515221

碩士 === 國立臺灣科技大學 === 工程技術研究所 === 86 === Its geographical location has given Taiwan a hot and humid environment; hence building materials end up with shorter life expectancies, especially the traditional building materials.During the renovation of traditional buildings, I encountered papers concerning wooden frameworks; however no studies were ever conducted on "earthen wall" and "lime mortar". Therefore, this paper shall employ the cold adhesion method to study the "earthen wall" and "lime mortar". The principal concern of this paper is "how protective coating coated on the surface of traditional building materials affect its durability". Local and foreign "durability test" data were compiled and analyzed to determine the suitable test measure and propose a test framework. Actual tests were conducted to examine the effects of protective coating on the durability of test subjects. The test feasibility was evaluated for future test reference purposes. The procedure used was mainly based on field surveys, while documentary data served as supplements.The research was aimed to study the production process of test subjects; data obtained served as the reference standard samples. The analysis of the factors affecting the durability of traditional building materials and the durability evaluation method followed.Local and foreign documentary data concerning durability tests were also compiled and analyzed to find out the test suitable for determining "the effect of protective coating on the durability of earthen wall and lime mortar ". The "efflorescence test" was used to test the binding ability of surface molecules of the aforementioned analysis and design of the test subjects after deterioration sets in. The "color change test" was used to observe the color changes and the "permeability test" examined the permeation resistance of surfaces after deterioration sets in. The "depth of penetration test" equipment sped up the molecular bond destruction of the test subject, so test may be completed within a short period of time. Furthermore, analytical criteria for the problems faced by traditional building materials coated with protective coating was proposed to define the test procedures. Three types of coatings were chosen and subjected to test procedures, then findings were compared and cross-referenced with each "new" and "old" sample based on the analytical criteria. Finally a comprehensive appraisal was conducted on the coatings, including their respective samples, that effectively reduced the efflorescence, surface color change and permeability of the sample surface. The following findings were revealed by the actual tests conducted: 1. "Accelerated weathering tests" conducted before and after the "accelerated exposure test" revealed the difference between the efflorescence weight. It also allows an initial understanding of the reduction effect of protective coating on the surface efflorescence development of test subjects. 2. The "color change test" determines, through comparison, whether changes occurred on the surface of test subjects. However, in the matter of protective coating, other tests are necessary to identify existing reasons, so one may determine whether coating affects surface color changes. 3. "Accelerated weathering tests" conducted before and after the "depth of penetration test" showed the eight-hour space, time and water level reduction curve analysis graph. It also allows one to initially conclude that the permeability of the protective coating coated on the surface of test subjects changes with time. The test methods established in this study and findings from actual operations revealed the following: A detailed preparatory work plan (such as protective coating selection, test subject selection and quantification, sample production and quantity, etc.) is necessary. Moreover, tests conducted revealed that tests conducted for different building materials also vary. In the future, studies should concern a particular building materials and focus should be on a single concern, tests should also conduct a more in-depth analysis. Finally, future research studies were proposed based on the aforementioned information.