Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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The Measurement of Physical Properties of Outdoor Exposed Members

  • Kim, Gwang-Chul (Department of Housing Environmental Design, Chonbuk National University) ;
  • Kim, Jun-Ho (Department of Housing Environmental Design, Chonbuk National University)
  • Received : 2019.03.15
  • Accepted : 2019.05.13
  • Published : 2019.05.25
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Abstract

The number of newly constructed traditional Korean houses, i.e., Hanoks, and light-frame buildings is increasing. However, related research is limited owing to the lack of awareness regarding safety evaluations. Therefore, this study conducted an outdoor exposure test to accurately evaluate wooden constructions. Spruce, pine, and fir (SPF) material was monitored for a year, wherein the SPF material was artificially dried under 18% moisture content, and its physical properties and color differences were measured once a month. Large differences were observed in the material's weight and moisture content, which are indexes sensitive to daily range and rainfall; however, no significant difference was found for other basic properties in the pre and post test results. Herein, $L^*$, $a^*$, and $b^*$ values represent color differences; these values exhibited a general decrease after the test. Such differences were attributed to the loss of lignin in the wood. The color difference value was high between the months of May and July, when the daily range and rainfall significantly fluctuated. Multiple regression analysis was performed on the $a^*$ value (redness indicator), daily range, rainfall, and ultraviolet index. The results indicated that the daily range influenced redness the most. According to the estimated regression equation, the daily range and redness are positively correlated. Based on the results, the types and influence of independent variables on color difference are expected to change as the wood's duration of outdoor exposure and the amount of data obtained both increase.

Keywords

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Fig. 1. The measurement of physical properties.

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Fig. 2. South Florida Radiant (McGreer, 2003).

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Fig. 3. Test desks for the outdoor exposure.

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Fig. 4. Field record.

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Fig. 5. Details for the color difference test.

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Fig. 6. Details for the color difference test.

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Fig. 7. The daily temperature range and rainfall in 2017.

Table 1. Numbers of wooden construction begin in Korea. (Statistics Korea)

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Table 2. Specimen information

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Table 3. The changes of basic physical properties

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Table. 4. The comparison of weight loss

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Table 5. Average of color values

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Table 6. Average of ΔE.

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Table 7. Sensitive expression of color difference by N.B.S Unit 6.0

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Table 8. ANOVA table for the ∆E

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Table 9. Multiple regression analysisREGRESSION ANALYSIS STATISTIC

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Table 10. Simple regression analysisREGRESSION ANALYSIS STATISTIC

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