Cement-bonded particleboards using CCA-treated wood removed from service

Wood-cement composites are one option for the recycling of spent chromated-copper-arsenate-(CCA) treated wood. This paper evaluates the effects of CCA-treated wood on selected properties of cement-bonded particleboard. CCA-treated wood is more compatible with Portland cement than untreated wood, resulting in boards with improved bending strength and stiffness, internal bond (IB) strength, and water absorption (WA), and thickness swelling (TS) performance. Incorporation of CCA-treated particles in a Portland cement matrix greatly reduced the leaching of copper and arsenic; however, chromium leaching was not reduced. Exposure of cement-bonded particleboards to decay fungi in a soil jar exposure indicated that untreated particles could undergo limited decay, while boards with CCA-treated particles were protected from deterioration. Generally, boards produced with higher water ratios and higher cement ratios had better physical and mechanical properties. For a given water/cement wood ratio, boards produced at a density of 1.3 g/cm3 were of inferior quality compared to those produced at 1.2 g/cm3. Of the boards evaluated, those having a density of 1.2 g/cm3 and a cement/wood/water ratio of 1/0.33/0.6 produced the highest quality boards. All physical and mechanical properties could be modeled with multi-linear equations relating the above variables with a high degree of confidence.

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