The document analyzes the physical, mechanical, and structural properties of Aleppo pine (Pinus halepensis) wood from northeastern Spain. Testing showed the clear wood has slightly higher density, hardness, and bending/compression strength than other common Spanish pines, but more shrinkage. Visual grading of timber beams found 77% were rejected due to defects. The remaining beams could achieve a C14 strength class, lower than other Spanish species with existing grading norms (C18). While the clear wood compares well, the low timber quality and high rejection rate mean Aleppo pine is currently only suitable for low-loading applications like pallets.
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L'objectiu del curs és donar a conèixer la fusta com a material estructural, introduir el càlcul d’estructures de fusta i exposar la normativa aplicable i les solucions constructives més habituals.
Curs gratuït del Pla de Formació del Ministerio de Empleo. Durant el curs s’impartirà un mòdul d'emprenedoria, inclòs en l’acció formativa.
Propiedades básicas de la madera de
del pirineo francés y catalán
Pinus
uncinata
Proyecto Unciplus Acción Nº4 - Caracterización tecnológica y mecánica de la madera de pino negro
Institut Català de la Fusta - INCAFUST
Inspecció i diagnosi in situ d’estructures i elements de fusta amb la possibilitat d’analitzar la incidència dels defectes ocasionats per la degradació del material i les alteracions de tipus estructural aparegudes en elements de fusta mitjançant tècniques d’exploració específiques, com l’anàlisi termogràfica, els perfils resistogràfics o la detecció acústica d’insectes xilòfags
Insitut Català de la Fusta (INCAFUST) es una ent-
dad sin ánimo de lucro, que tiene por finalidad
promover el desarrollo y el reconocimiento de la
madera como material y contribuir a la mejora de
la competividad, fomento de la innovación y
aumento de la productividad del sector de la madera.
La misión del Instuto es asisir a las empresas,
en dades y instuciones del sector mediante la
investigación, la prestación de servicios tecnológicos,
la transferencia de tecnología y de conocimientos
y la formación.
The Catalan Institute of Wood (INCAFUST)
is a nonprofit private organization that
has the aim to promote and develop wood
acknowledgement as material, and contribute
to improve the competitiveness,
innovation promotion and productivity
increment of the Catalan timber industry
as well.
The institute’s main aim is to assist enterprises,
organitzations and institutions by
helping them on research, technological
services, technology and knowledge transference
and education.
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This will be used as part of your Personal Professional Portfolio once graded.
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L'objectiu del curs és donar a conèixer la fusta com a material estructural, introduir el càlcul d’estructures de fusta i exposar la normativa aplicable i les solucions constructives més habituals.
Curs gratuït del Pla de Formació del Ministerio de Empleo. Durant el curs s’impartirà un mòdul d'emprenedoria, inclòs en l’acció formativa.
Propiedades básicas de la madera de
del pirineo francés y catalán
Pinus
uncinata
Proyecto Unciplus Acción Nº4 - Caracterización tecnológica y mecánica de la madera de pino negro
Institut Català de la Fusta - INCAFUST
Inspecció i diagnosi in situ d’estructures i elements de fusta amb la possibilitat d’analitzar la incidència dels defectes ocasionats per la degradació del material i les alteracions de tipus estructural aparegudes en elements de fusta mitjançant tècniques d’exploració específiques, com l’anàlisi termogràfica, els perfils resistogràfics o la detecció acústica d’insectes xilòfags
Insitut Català de la Fusta (INCAFUST) es una ent-
dad sin ánimo de lucro, que tiene por finalidad
promover el desarrollo y el reconocimiento de la
madera como material y contribuir a la mejora de
la competividad, fomento de la innovación y
aumento de la productividad del sector de la madera.
La misión del Instuto es asisir a las empresas,
en dades y instuciones del sector mediante la
investigación, la prestación de servicios tecnológicos,
la transferencia de tecnología y de conocimientos
y la formación.
The Catalan Institute of Wood (INCAFUST)
is a nonprofit private organization that
has the aim to promote and develop wood
acknowledgement as material, and contribute
to improve the competitiveness,
innovation promotion and productivity
increment of the Catalan timber industry
as well.
The institute’s main aim is to assist enterprises,
organitzations and institutions by
helping them on research, technological
services, technology and knowledge transference
and education.
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Properties of clear wood and structural timber of Pinus halepensis fromnorth-eastern spain INCAFUST
1. Properties of clear wood and structural timber
of from north-eastern spainPinus halepensis
Eduard Correal-Mòdol - Marcel Vilches Casals
INSTITUT CATALÀ DE LA FUSTA - CATALAN INSTITUTE OF WOOD
Headquarters: Ctra. Sant Llorenç, km.2 - 25280 Solsona. T. 973 484232 - F. 973484231
www.incafust.org - @incafust
Introduction
TheAleppo pine ( ) is a tree species spread all around the Mediterranean
basin including the islands. It grows mostly from sea level to 1.000 m. In Spain is most
abundant from 200 m to 600 m because lower altitudes are occupied by crops or
urbanized areas. It is a xerophilous and heliofilous species with little and irregular annual
growth. The biggest trees may reach 50 cm of diameter and 20 m height but they usually
don't get over 40 cm and 15m. The stem it is not very straight, large branches are
common, therefore has low quality. It has an average growth of 2.4 m /ha/yr. The Aleppo
Pine nowadays in Spain it is mainly being used by the packaging industry for producing
pallets. However, traditionally round trunks were used as beams in isolated houses
located nearby the forests, especially in the Mediterranean coast where it is the most
abundant tree. The goal of the study was to characterize the physical, mechanical and
structural properties for knowing the potential of the Aleppo pine for building. This is quite
relevant because nowadays is widely believed that Aleppo pine timber is not suitable for
structural use despite its beams are found in ancient buildings.
Pinus halepensis
3
info@incafust.org
Table 1. Physical and mechanical clear wood properties
Figure 1. World distribution of (Bioversity International, 2011)Pinus halepensis
Materials and methods
The study is divided in two: characterization of clear wood and characterization of
structural timber. The timber used in the experiment came from the region of provenance
“Catalunya interior”. 100 beams were from the “Serra de Prades” (Tarragona) and they
had nominal dimensions of 50×150×2850 mm. There were other 81 smaller beams from
“Prats de Lluçanes” (Barcelona) with nominal dimensions of 45×110×2000 mm. 68
beams of Aleppo Pine from “Serra de Prades” and “El Lluçanès” were accepted after
being visually graded according to the criteria of UNE-EN 14081-1:2006+A1 and UNE
56544:2007. Clear wood test samples were made according to UNE 56528:1978
(AENOR, 1978) and afterwards conditioned at 20ºC and 65% of relative air humidity until
they reached 12% of moisture content.
Figure 2. Clear wood sample on the bending test
Results: Clear wood properties
The Aleppo pine clear wood is slightly denser, harder, and has more bending and
compression strength than the other most common pines grown in Spain as a source of
timber. However, the reaction to moisture is more unstable because it has more
shrinkage. (Table 1).
Results: Mechanical characterization
The 77% of the beams were rejected on the visual grading. The batch of “Serra de
Prades” was entirely rejected because big knots and large deformations, however 41
beams of the batch of "El Lluçanès" were classified as ME-2-like specimens.
Unfortunately there were very few ME-1. The Aleppo pine ME-2-like timber is relatively
stiff and heavy comparing it with its loading capacity. The MOR is what limits the strength
class to C14. The cause of this behaviour is the high incidence of the defects on the
resistance. The Aleppo pine demonstrated a far lower strength class than the Spanish
species that already have a visual grading norm: C18 vs C14 (UNE 56544). The beams
don't crunch or crack much during the load because the timber is rigid, but the breakings
are sudden and violent and all the energy is released at once. Most beams resulted
seriously damaged when broke. This behaviour is probably due to the material can't much
cope with plastic strain.(Table 2).
Conclusions
The clear wood of has better resistance than other Spanish coniferous used in timber structures. However there is little difference.
Unfortunately the timber has a low quality and a lot of rejection. Thus, it is necessary to invest on silvicultural works. The Aleppo Pine from North-
eastern Spain (Catalonia) is the native pine timber with the lowest load capacity. The timber visually graded according to the criteria of the ME-2 class
on the UNE 56544:2007 might be considered C14. Only one quality strength class should be purposed for this species if included on a visual grading
norm. On one hand, the high quality timber is rare, and on the other, it will ensure at least a C14 strength class when including also the best samples on
a unique batch.
Pinus halepensis
ME-2-like Rejected
41 27
25.34 18.88
Sn-1 3.86 6.96
P5 18.76 8.77
Ch. Value 13.62 6.37
10,718.39 10,285.56
Sn-1 1,150.35 1,797.28
P5 8,901.50 8,168.56
Ch. Value 8,777.27 8,422.83
611.47 580.79
Sn-1 40.29 37.28
P5 575.24 513.65
Ch. Value 679.42 606.67
C14 RejectedStrength class
Property
Beams tested
MOR
(N/mm
2
)
MOE
(N/mm
2
)
Density
(kg/m
3
)
x
x
x
Property Sn-1
Density (kg/m
3
) 589.91 55.01
Shrinkage (%) 14.13 2.33
Shrinkage coefficient (%) 0.45 0.072
Higroscopicity (kg/m
3
) 0.0032 0.0004
Hardness (mm
-1
) 4.26 1.22
Axial compressive strength (kg/cm2
) 594.91 76.57
Bending strength (kg/cm
2
) 1,106.82 175.23
x
Table 2. Visually graded timber: MOR, MOE and density
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Figure 3. Shattered beam of Aleppo pine on bending test
Figure 3. Shattered beam of Aleppo pine on bending test