SciELO - Scientific Electronic Library Online

vol.16 issue4The effect of thermal treatment on physical and mechanical properties of Luehea divaricata hardwoodPredicting the young’s modulus of defect free radiata pine shooks in finger-jointing using resonance frequency author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google


Maderas. Ciencia y tecnología

On-line version ISSN 0718-221X


LEBOW, Stan. Effect of precipitation pattern on leaching of preservative from treated wood and implications for accelerated testing. Maderas, Cienc. tecnol. [online]. 2014, vol.16, n.4, pp.423-434.  Epub Aug 21, 2014. ISSN 0718-221X.

There is a need to develop improved accelerated test methods for evaluating the leaching of wood preservatives from treated wood exposed to precipitation. In this study the effects of rate of rainfall and length of intervals between rainfall events on leaching was evaluated by exposing specimens to varying patterns of simulated rainfall under controlled laboratory conditions. Lumber specimens were pressure-treated with 0,5; 1 or 2% solutions of chromated copper arsenate (CCA) and exposed to 762 mm of rainfall at rates of 2,5; 8 or 25 mm/h. Intervals between rainfall events were increased for some specimens. Leachate was periodically collected and analyzed to quantify leaching of arsenic, chromium and copper. The quantity of CCA elements leached, per unit rainfall, was consistently greatest at the lowest rainfall rate for all solution concentrations evaluated. Incorporation of additional time between rain events increased leaching at the lowest rainfall rate, but this effect was less noticeable as rainfall rate increased. The results of this study indicate that simulated rainfall leaching tests should be conducted using rainfall intensities at the lower end of those that are typical for the region of interest. The lengths of intervals between rainfall events may also increase leaching, but use of lengthy resting intervals conflicts with the goal of accelerated testing. Further research may be warranted to optimize time between rainfall events and assess the effect of drying periods between rainfall events.

Keywords : Wood preservative; leaching; accelerated testing; precipitation; rainfall intensity.

        · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License