| Summary: | 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.
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