The effect of cyclic relative humidity exposure, sanding and grooving on the dimensional stability of solid wood parquet

In this study, the effect of cyclic relative humidity changes, sanding and grooving on the dimensional stability of solid wood parquet were evaluated. The experiments were carried out on oak (Quercus petraea) and sapele (Entandrophragma cylindiricum) wood species. Firstly some physical tests (density, shrinkage, and swelling) were carried out on 20×20×30 mm specimens obtained from these two species. After the physical tests the parquet size specimen groups were ob- tained both in radial and tangential section directions and in two sizes; narrow (250×50×15 mm) and wide (250×90×15 mm). One group of parquet size spec- imens was sanded and the other group was grooved. There was also a group of specimen for control. After being conditioned to equilibrium moisture content at 65% relative humidity, specimens were placed in a climate chamber and exposed to cyclic relative humidity changes. The dimensions of the specimens were measured between different environmental conditions and the dimensional change was evaluated by taking into consideration the mentioned physical properties. The results show that cyclic relative humidity changes mainly resulted with an increase in the dimensional stability of sanded and cyclic conditioned specimens. There was not a significant change in the dimensional stability of grooved specimens.

PDF

___

Bekhta P. & Niemz P. (2003). Effect of high temperature on the change in color, dimensional stability and me- chanical properties of spruce wood. Holzforschung, 57(5), 539-546.

Booker R.R., Ward N. & Williams Q. (1992). A theory of cross-sectional shrinkage distortion and its experi- mental verification. Wood Science and Technology, 26(5), 353-368.

Chotikhun A. & Hızıroğlu S. (2016). Measurement of dimensional stability of heat treated southern red oak (Quercus falcate Michx.). Measurement, 87, 99-103.

Constant T., Badia M.A. & Mothe F. (2003). Dimensional stability of Douglas fir and mixed beech – poplar plywood: experimental measurement and simulations. Wood Science and Technology, 37(1), 11-28.

Deteix J., Djoumna G., Blanchet P., Fortin A. & Cloutier A. (2012). Minimizing flooring strip weight: A shape optimization approach. Bioresources, 7(2), 1931-1947.

Eligon A.M., Achong A. & Saunders R. (1992). Moisture adsorption and desorption properties of some tropical woods. Journal of Materials Science, 27(13), 3442-3456.

Esteban L.G., Gril J., de Palacios P. & Guindeo Casasus A. (2005). Reduction of wood hygroscopicity and associated dimensional response by repeated hu- midity cycles. Annals of Forest Science, 62(3), 275-284.

Forest Service U.S. Department of Agriculture, (1957). Shrinking and Swelling of Wood in Use (Forest Products Laboratory Report No. 736, 1957). Madison: Forest Products Laboratory.

Gunnar Salin J. (2011). Inclusion of the sorption hysteresis phenomenon in future drying models. Some basic considerations. Maderas Ciencia y Tecnologia, 13(2), 173-182.

Hyttinen M., Masalin-Weijo M., Kalliokoski P. & Pasanen P. (2010). Comparison of VOC emissions between air-dried and heat-treated Norway spruce (Picea abies), Scots pine (Pinus sylvestris), and European aspen (Populus tremula) wood. Atmospheric Environment, 44(38), 5028-5033.

Juodeikiené I. (2013). Influence of thermal treatment on the hygroscopicity and dimensional stability of oak wood. Materials Science, 19(1), 51-55.

Kocaefe D., Huang X. & Kocaefe Y. (2015). Dimensional stabilization of wood. Current Forestry Reports, 1(3), 151-161.

Melin C.B. & Bjurman J. (2017). Moisture gradients in wood subjected to relative humidity and temperatures simulating indoor climate variations as found in museums and historic buildings. Journal of Cultural Heritage, 25, 157-162.

Németh R., Molnárne Posch P., Molnár S. & Bak M. (2014). Performance evaluation of strip parquet flooring panels after long-term in-service exposure. Drewno, 57(193), 119-134.

Rode C. & Clorius C.O. (2004). Modeling of moisture transport in wood with hysteresis and temperature-dependent sorption characteristics. Performance of Exterior Envelopes of Whole Buildings IX Conference, Florida, December 5-10, Oak Ridge National Laboratory Press, USA.

Różańska A. (2013). FT-NIR spectral analysis of the surface of samples obtained from wooden parquets of 19 th century manor houses located in South-Eastern Poland for determination the manner and the soaked substances. (IVALSA Tree Institute Report Code: COST-STSM-ECOST-STSM- FP1006-230912-026985, 2013). Italy.

Tomak E.D., Ustaömer D., Yıldız S. & Pesman E. (2014). Changes in surface and mechanical properties of heat treated wood during natural weathering. Measurement, 53, 30-39.

Toydemir N., Gürdal E. & Tanaçan L. (2000). Yapı Elemanı Tasarımında Malzeme (Material in Building Member Design). Istanbul, Turkey: Literatür Publishing.

Turkish Standards. (1988). Solid wood raw parquet blocks – Manufactured from broadleaved wood (TS 2039). Istanbul: TSE.

Turkish Standards. (1976). Wood – Determination of density for physical and mechanical tests (TS 2472). Istan- bul: TSE.

Turkish Standards. (1983). Wood – Determination of radial and tangential shrinkage (TS 4083). Istanbul: TSE.

Turkish Standards. (1983). Wood – Determination of radial and tangential swelling (TS 4084). Istanbul: TSE. Turkish Standards. (2003). Wood and parquet flooring and wood paneling and cladding (TS EN 1910). Istanbul: TSE.

Tsoumis G. (2009). Science and Technology of Wood, Structure, Prop- erties, Utilization. Remagen, Germany: Verlag Kessel.

Wang S.Y., Tsai M.J., (1998). Assess- ment of temperature and relative hu- midity conditioning performances of interior decoration materials. Journal of Wood Sciences, 44: 267-274.