Effect of salt water evaporation on tracheid separation from wood surfaces

This study simulated the seawater wetting of marine piling, which sometimes results in development of fuzzy, brown surfaces just above high tide level. Untreated and treated (chromated copper arsenate (CCA) and creosote) blocks were intermittently wetted with distilled water or synthetic seawater and dried at 130?F (54?C). Tracheid separation first became apparent after about 100 wet/dry cycles and gradually became more pronounced. Tracheid separation was more pronounced in latewood than in earlywood and in blocks with a greater retention of CCA. Scanning electron and light microscopy revealed checks along the microfibril angle in tracheid walls of CCA-treated wood repeatedly wetted with seawater.

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