THE EFFECTS OF PRE-ACID TREATMENT ON PRESERVATIVE RETENTION AND COMPRESSION STRENGTH OF REFRACTORY SPRUCE WOOD IMPREGNATED WITH CCA AND ACQ

This study investigates the effects of pre-acid (sulphuric acid and phosphoric acid) treatment on preservative retention and compression strength of refractory spruce wood (Picea orientalis L.) impregnated with chromated copper arsenate (CCA) and ammoniacal copper quat (ACQ ). Before the CCA and ACQ treatments, the samples were treated by sulphuric acid or phosphoric acid solutions of 0.5 % by using pressure and nonpressure methods. After the pre-acid treatments, the samples re-impregnated with the solutions of 2 % CCA-Type C and 2 % ACQ-1900 preservatives according to the non-pressure method. The results of this study indicated that pre-acid treatment with pressure was more effective than non-pressure method for increasing of retention of both CCA and ACQ. The compression strength of oriental spruce wood samples was reduced 12-31 % after pre-acid treatment for both pressure and non-pressure methods.

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