Deliverable 6: List of ongoing experiments - Ctba

As far as wood quality is concerned, 3 non destructive methods were tested and correlated to the results obtained
with the usual destructive methods: ultrasound analysis (Sylvatest/ CTBA), vibrator analysis and resistance
analysis. This latter is achieved thanks to a machine called ‘resistograph’ which measure the rate of penetrability
of a screw into the wood in a diametrical direction.
CTBA and AFOCEL have also carried out a survey among the south west industrial sites to gather information
on equipment, costs and to assess the defects and the advantages of their wood conservation.
Intermediary results:
By a period of 2 years, the toxicity involved by the 3 different types of log conservation seems to remain low but
fluctuates within the very first months.
Concerning the wood quality, the association of the non destructive methods appears to be an efficient system to
measure MOE and MOR since their results are well correlated with the ones obtained with destructive methods.
Furthermore, it seems that the mechanical features do not degrade even after a 2 years conservation period of
time.
The first results after 8 months showed that whereas most of the untreated logs were bluestained, 73 % to 100 %
of water-immersed logs and 94 % to 100 % of water-sprayed logs were preserved with less than 6 % of
bluestained area. Moreover, neither preservation method led to a loss of modulus of elasticity or of rupture.
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Project Coordinator : CTBA, 10 avenue de Saint Mandé 75012 Paris, www.ctba.fr/stodafor/index.htm
Project partners : FVA (D), KVL (DK), EMPA (CH), CBE (P), BFH (D), UPM (E), DLFRI ( DK), TTI (I), AFOCEL (F), TUD (D), BRE
(UK), FMRE (A), ICSTM ( UK), UOP (UK), NISK (N)