Download (BE) and Joris Van Acker

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
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