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Moisture performance testing of wood‐based materials under laboratory conditions Joris Van Acker Jan Van den Bulcke Imke De Windt Wanzhao Li Nele Defoirdt FP1303 – Paris – 27-29 January 2014 Time of Wetness (moisture dynamics) • Key for exterior uses out of ground contact always wet in ground contact • Service life out of ground contact can be realised even for non‐durable wood products • Principles to lower time of wetness ‐ Protection by design ‐ Coatings ‐ Hydrophobic treatment ‐ Composition and structure of wood‐based materials Assessing field data Continuous Moisture Measurements: CMM CMM – Continuous Moisture Measurements • moisture dynamics ‐> durability (moisture – fungi) • continuous monitoring ‐> weighing ‐> weather data • ageing phenomenon CMM (Van den Bulcke et al. 2009) WEATHER STATION SAMPLE DATA STORAGE LOAD CELL Hours 6 months MC (%) Understanding moisture dynamics X‐ray CT scanning Liquid water Oven dry water ingress X-ray MC and Gravimetrical MC Electrical MC CT images of water ingress Relative humidity MDF 60% 10% RH Laboratory simulation Floating and submersion tests: absorption and desorption RR Floating ‐ water uptake (g/m²) PINE‐SAP 4000 BEECH 3000 POPLAR 2000 SPRUCE OAK 1000 SAPELLI PINE‐HW 0 0 50 100 150 TM‐SPR RR Floating ‐ water release (g/m²) Time (hours) 5000 Floating & Submersion Water release (g/m²) Water uptake (g/m²) 5000 PINE‐SAP 4000 BEECH 3000 POPLAR 2000 SPRUCE OAK 1000 SAPELLI PINE‐HW 0 0 50 100 Time (hours) 150 TM‐SPR Floating (%) FDA clustering ‐ PCA Submersion (%) < FDA clustering ‐ PCA MC (%) Comparing with CMM ‐> isolation of 3 rain events CMM – correlation with floating test Similar results but some shifts due to weathering Water uptake Water uptake Dynamics CMM () compared to lab test () Dynamics FDA PCA THANK YOU [email protected] [email protected] [email protected] [email protected] [email protected] Rik De Rycke & Stijn Willen All pictures are property of UGent ‐ WOODLAB (or mentioned otherwise) It is not allowed to use them without permission