Effects of Creosote and Cca on Moisture Movement in Southern Pine and Red Oak

Authors

  • Carole A. Hornicsar
  • Paul R. Blankenhorn
  • David A. Webb

Keywords:

Southern pine, red oak, permeability, moisture movement

Abstract

A vapocup apparatus was used to determine rates of moisture movement and water-vapor permeability values for CCA- and creosote-treated red oak and southern pine. The average loading for CCA-treated specimens was 6.4 kg/m3 (0.4 lb/ft3) and the average loading for creosote-treated specimens was 168.2 kg/m3 (10.5 lb/ft3). Specimens were subjected to three different relative humidity conditions: 50%, 75%, and 90%. The rates of mass transfer increased exponentially with increasing relative humidity. The rate of moisture movement was greater for southern pine than for red oak, and greater for CCA-treated specimens than for creosote-treated specimens. The water-vapor permeability values were calculated and the values increased exponentially as relative humidity increased. For both species, CCA-treated specimens had the highest water-vapor permeability values and creo-sote-treated specimens the lowest.

References

Bendtsen, B. A. 1966. Sorption and swelling characteristics of salt-treated wood. U.S. Forest Service Forest Products Lab. Rep. 60. 45 pp.nChristensen, G. N. 1960. Kinetics of water vapor sorption by wood. I. The effect of sample thickness. Australian J. Applied Sci. 11:294-304.nHart, C. A. 1970. Water-filled lumens in steady state flow in oak and poplar. Wood Fiber 1(4):308-318.nHornicsar, C. A. 1983. Effect of creosote and CCA on moisture movement in southern pine and red oak. M.S. thesis, The Pennsylvania State University.nKumar, S., and V. K. Jain. 1978. Effects of wood preservatives on physical properties of wood. II. Effects of different salt loadings of copper-chrome-arsenic composition. Wood Fiber 9(4):262-269.nSAS User's Guide. 1979 edition. SAS Institute, Inc., Raleigh, NC. 494 pp.nSiau, J. F. 1984. Transport processes in wood. Springer-Verlag, New York. 245 pp.nSkaar, C. 1954. Analysis of methods for determining the coefficient of moisture diffusion in wood. Forest Prod. J. 4(6):403-410.nSkaar, C. 1958. Moisture movement in beechwood below fiber saturation point. Forest Prod. J. 8(12):352-357.nStamm, A. J. 1947. Passage of liquids, vapors, and dissolved materials through softwoods. USDA Tech. Bulletin No. 949. 80 pp.nStamm, A. J. 1950. Bound-water diffusion into wood in the fiber direction. Forest Prod. J. 9(1):27-32.nStamm, A. J. 1960a. Bound-water diffusion into wood in across the fiber direction. Forest Prod. J. 10(10):524-528.nStamm, A. J. 1960b. Combined bound-water and water vapor diffusion into Sitka Spruce. Forest Prod. J. 10(12):644-648.n

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Published

2007-06-28

Issue

Number 1 / January 1987

Section

Research Contributions

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