Page 53 - Kutnar, Andreja, et al., eds., 2015. Proceedings of the 1st COST Action FP1307 International Conference - Life Cycle Assessment, EPDs, and modified wood. University of Primorska Press, Koper.
P. 53
ect
of
natural
weathering
and
accelerated
aging
on
Pinus
sp.
Patrícia
S.
B.
dos
Santos1,
Silvia
H.
F.
da
Silva2,
Caroline
R.
Soares3,
Darci
A.
Gatto4,
Jalel
Labidi5
1
Chemical
and
Environmental
Engineering
Department,
University
of
the
Basque
Country,
San
Sebastian,
Spain,
patricia.bilhalva@hotmail.com
2
Chemical
and
Environmental
Engineering
Department,
University
of
the
Basque
Country,
San
Sebastian,
Spain,
silviahfuente@hotmail.com
3Center
Engineering,
Federal
University
of
Pelotas,
Pelotas,
Brazil,
carolsoares07@hotmail.com
4Center
Engineering,
Federal
University
of
Pelotas,
Pelotas,
Brazil,
darcigatto@yahoo.com
5
Chemical
and
Environmental
Engineering
Department,
University
of
the
Basque
Country,
San
Sebastian,
Spain,
jalel.labidi@ehu.eus
Keywords:
finishes,
colour,
roughness,
wood
technology
Wood
is
susceptible
to
adverse
weather
conditions
that
cause
degradation
through
mechanisms
like
photo
degradation.
This
causes
surface
cracking
and
modifies
wood’s
properties
and
durability
while
in
service.
This
study
aimed
to
evaluate
two
methods
of
wood
exposure
in
the
extreme
south
region
of
Brazil
where
the
climate
is
classified
CFA
(humid
subtropical
Mild)
without
a
dry
and
hot
summer
season.
This
study
compared
accelerated
and
natural
weathering
methods
and
characterized
the
changes
of
wood
with
various
surface
coatings
compared
to
raw
wood.
Wood
(Pinus
sp.)
from
Brazil
was
evaluated
for
roughness,
colour,
and
weight
loss
after
natural
weathering
and
accelerated
aging.
The
boards
were
dried
in
a
climatic
chamber
until
they
reached
a
constant
weight
and
were
then
flattened
and
cut
in
the
laboratory.
15
specimens
(150
mm
x
95
mm
x
25
mm)
were
created.
Five
specimens
were
treated
with
spray
paint
(bright
white,
Finish
1),
five
were
treated
with
synthetic
enamel
ink
(bright
white,
Finish
2),
and
five
specimens
were
untreated
controls.
Both
coatings
were
applied
according
to
the
manufacturer's
guidelines
and
dried
for
72
hours
before
being
analysed
according
to
ASTM
G154.
A
standard
cycle
of
12
hours
was
comprised
of
exposure
to
8
hours
light
at
60
°C,
25
minutes
of
condensation
at
room
temperature
and
no
light,
followed
by
3.35
hours
of
condensation
at
50
°C.
Measurements
were
made
at
the
beginning
and
after
240
hours.
For
the
natural
weathering
specimens,
colorimetric
and
roughness
measurements
were
performed
at
the
beginning
and
after
180
days.
The
data
collected
(Fig.
1,
Table
1)
from
accelerated
weathering
for
240
hours
of
exposure
is
similar
to
the
data
collected
in
natural
weathering
for
180
days
of
exposure.
The
samples
used
were
taken
from
the
same
region
of
the
log,
limiting
confounding
variables
such
as
density
or
the
porosity
of
the
wood.
41
of
natural
weathering
and
accelerated
aging
on
Pinus
sp.
Patrícia
S.
B.
dos
Santos1,
Silvia
H.
F.
da
Silva2,
Caroline
R.
Soares3,
Darci
A.
Gatto4,
Jalel
Labidi5
1
Chemical
and
Environmental
Engineering
Department,
University
of
the
Basque
Country,
San
Sebastian,
Spain,
patricia.bilhalva@hotmail.com
2
Chemical
and
Environmental
Engineering
Department,
University
of
the
Basque
Country,
San
Sebastian,
Spain,
silviahfuente@hotmail.com
3Center
Engineering,
Federal
University
of
Pelotas,
Pelotas,
Brazil,
carolsoares07@hotmail.com
4Center
Engineering,
Federal
University
of
Pelotas,
Pelotas,
Brazil,
darcigatto@yahoo.com
5
Chemical
and
Environmental
Engineering
Department,
University
of
the
Basque
Country,
San
Sebastian,
Spain,
jalel.labidi@ehu.eus
Keywords:
finishes,
colour,
roughness,
wood
technology
Wood
is
susceptible
to
adverse
weather
conditions
that
cause
degradation
through
mechanisms
like
photo
degradation.
This
causes
surface
cracking
and
modifies
wood’s
properties
and
durability
while
in
service.
This
study
aimed
to
evaluate
two
methods
of
wood
exposure
in
the
extreme
south
region
of
Brazil
where
the
climate
is
classified
CFA
(humid
subtropical
Mild)
without
a
dry
and
hot
summer
season.
This
study
compared
accelerated
and
natural
weathering
methods
and
characterized
the
changes
of
wood
with
various
surface
coatings
compared
to
raw
wood.
Wood
(Pinus
sp.)
from
Brazil
was
evaluated
for
roughness,
colour,
and
weight
loss
after
natural
weathering
and
accelerated
aging.
The
boards
were
dried
in
a
climatic
chamber
until
they
reached
a
constant
weight
and
were
then
flattened
and
cut
in
the
laboratory.
15
specimens
(150
mm
x
95
mm
x
25
mm)
were
created.
Five
specimens
were
treated
with
spray
paint
(bright
white,
Finish
1),
five
were
treated
with
synthetic
enamel
ink
(bright
white,
Finish
2),
and
five
specimens
were
untreated
controls.
Both
coatings
were
applied
according
to
the
manufacturer's
guidelines
and
dried
for
72
hours
before
being
analysed
according
to
ASTM
G154.
A
standard
cycle
of
12
hours
was
comprised
of
exposure
to
8
hours
light
at
60
°C,
25
minutes
of
condensation
at
room
temperature
and
no
light,
followed
by
3.35
hours
of
condensation
at
50
°C.
Measurements
were
made
at
the
beginning
and
after
240
hours.
For
the
natural
weathering
specimens,
colorimetric
and
roughness
measurements
were
performed
at
the
beginning
and
after
180
days.
The
data
collected
(Fig.
1,
Table
1)
from
accelerated
weathering
for
240
hours
of
exposure
is
similar
to
the
data
collected
in
natural
weathering
for
180
days
of
exposure.
The
samples
used
were
taken
from
the
same
region
of
the
log,
limiting
confounding
variables
such
as
density
or
the
porosity
of
the
wood.
41
