SPECIE – TREATMENT - ADHESIVE COMBINATIONS
USING 4 BRAZILIAN REFORESTATION SPECIES,
3 PRESERVATIVE TREATMENTS AND
3 ADHESIVES FOR GLULAM PURPOSE.
Carlito Calil Neto Laboratory of Wood and Wood Structures (LaMEM),
University of Sao Paulo - BRAZIL
Glulam Industries
There are only 5 industries of Glulam . The cost of Glulam in these industries are around 4,000 reais ($ 2,000) per cubic meter, which make it competitiveness with tropical sawn timber and reforestation. Only information the Glulam in Chile costs $ 750 per cubic meter, and the United States and Canada in the order of $ 1,000 per cubic meter.
What is the diference?
Topics to be assessed:
Species?
Type of adhesive?
Preservative Treatment?
Control Quality?
GOAL
It is to propose a method of assay for the evaluation of
combinations of species of wood, and types of adhesive products for
the wood preservative treatments to be used in the production of
structural elements manufactured from glued laminated timber.
Moreover, it is intended to determine the class of use for three species
of wood with two types of adhesives and three different treatments
preservatives.
Standards
For this purpose we evaluated the proposed methods on
international standards:
CSA 0177-2006, - Canada
AITC A190.1-2007, - USA
EM 386-2001 - Europe
NCh2148.cR2010 - Chile
Types of adhesive
Polyurethane adhesive Use the moisture in the wood. In the bonding process, the water
contained in the substrate (eg the moisture in the wood) is reacted with an isocyanate portion of releasing carbon dioxide (CO2) and forming an amine.
Adhesive based on resorcinol
Especially recommended for collages resistant to cold water or boiling water, many organic solvents, mold and mildew, wet or dry heat, etc.. Among their applications stand out boats, ladders, water tanks, propellers, among other MLC beams, where the glue will temporarily or permanently exposed to the action of weathering.
Types of adhesive
Melamine-urea-formaldehyde adhesive (MUF)
Resins are aminoplastic thermoset resins primarily used in structural or non-structural glued timber products for exterior and semi-exterior uses, and are among one of the most commonly used adhesives for these purposes
Preservative treatment
CCA - chromated copper arsenate
The CCA preservatives are a family of products that present a
satisfactory compromise between efficiency, durability and safety.
CCB - chromated copper borate
Due to suspicions there too much appreciation of arsenic in certain types of environment in which the wood is used, there was concern about the wearer's exposure of wood treated with CCA product. With the use of CCB is a significant loss in resistance to leaching and efficiency of protection of the wood to insects, especially for wood to be installed for long periods.
CCB - Oxide
It is produced with pure oxides in the raw materials and do not
generate waste parts on the surfaces of treated recently. When in contact with the timber, undergoes a chemical change by redox
reactions, making it virtually insoluble in water.
CCB - Saline
Process boils down to a simple mixture of compounds in the form of salts, having the fixation of boron. For the CCB-treated wood - Base Salina, proved that after 150 hours, about 85% of boron were leached and, moreover, leads to the formation of residues on the surfaces of treated wood, which may cause environmental contamination, and make it harder to finishes and collages. Processo resume-se a uma
Montana Quimina S.A.
Preservative treatment
Species - Adhesive - Treatment
- Pine
- Teak
- Lyptus
- Parica’
- PURBOND HB S309
- CASCOPHEN RS-216M
- Melamine 1242 / 2542
- No
- CCA
- CCB
- CCBS
Methods
Thus, we selected three methods:
Shear
Delamination
The main reference to this type of assay are contained in
CSA Standard 0112.10.
Methods
Specie
S1
S2
S3
1
2
3
1
2
3
1
S3,2
3
visual classification
Transverse vibration classification
assembly
S1,1
S2,3
S1,3
2 S3,1
S2,1
S1,2
S2,2
S3,3
Methods
48Hrs underwather
Delamination Test
Shear Test
RESULTS AND DISCUSSION
Use Class
When tested for delamination Standard 0112.10 CSA believes that
the delamination of all glue lines of the specimen shall not exceed 1% For the shear test, it is assumed coefficient of variation of 28%, similar
to that prescribes the Brazilian Standard NBR 7190. One should take into account also the failure mode.
Specimens with total rupture in the line of Adhesive in humid conditions were classified as class internal use.
Combination Delamination Shear
Specie Adhesive Treatment (%)
fvo
(Mpa)
12% DP CV MR
fvo(MPa)
Saturated DP CV MR
Pine
Purbond
No 0.5 7.03 0.87 12.38 Wood 3.11 0.45 14.60 Wood
CCA 0.0 4.93 0.44 9.02 Wood 2.62 0.28 10.64 Wood
CCB 0.7 5.82 1.17 20.09 Wood 2.59 0.69 26.74 Wood
CCBS 0.9 5.01 0.23 4.69 Wood 2.93 0.15 4.95 Wood
Cascophen
No 0.6 5.63 0.46 8.17 Wood 4.09 0.24 5.92 Wood
CCA 0.7 5.76 0.45 7.84 Wood 4.10 0.51 12.56 Wood
CCB 0.6 7.05 0.40 5.60 Wood 4.86 0.65 13.44 Wood
CCBS 0.0 7.73 1.07 13.81 Wood 5.97 0.95 15.84 Wood
Melamine
No 0.3 7.01 0.45 12.23 Wood 3.01 0.55 10.55 Wood
CCA 0.2 7.52 0.54 10.38 Wood 2.99 0.68 5.65 Wood
CCB 0.4 6.22 0.33 5.85 Wood 2.76 0.77 6.54 Wood
CCBS 0.4 7.34 0.75 6.78 Wood 2.58 0.85 13.52 Wood
Parica
Purbond
No 0.0 5.06 0.48 11.29 Wood 2.12 0.44 14.80 Wood
CCA 0.1 5.50 0.55 9.40 Wood 2.15 0.29 10.98 Wood
CCB 0.0 4.83 0.77 25.47 Wood 2.33 0.67 11.95 Wood
CCBS 0.0 5.04 0.33 5.05 Wood 2.77 0.57 5.98 Wood
Cascophen
No 0.1 5.95 0.41 7.05 Wood 3.95 0.40 6.85 Wood
CCA 0.0 5.86 0.59 9.53 Wood 3.56 0.55 15.35 Wood
CCB 0.2 6.05 0.51 10.95 Wood 3.99 0.47 12.85 Wood
CCBS 0.0 5.78 0.25 8.56 Wood 4.08 0.98 12.11 Wood
Melamine
No 0.3 5.05 0.54 12.23 Wood 3.55 0.52 11.12 Wood
CCA 0.5 5.12 1.10 10.23 Wood 2.45 0.85 10.17 Wood
CCB 0.0 6.09 0.78 9.86 Wood 3.89 0.36 9.56 Wood
CCBS 0.1 5.45 0.89 4.56 Wood 2.15 0.45 8.86 Wood
Combination Delamination Shear
Specie Adhesive Treatment (%)
fvo
(Mpa)
12% DP CV MR
fvo(MPa)
Saturated DP CV MR
Teak
Purbond
No 1.9 4.77 1.11 23.19 Wood 5.65 1.29 22.89 Wood
CCA 2.8 6.78 0.72 10.60 Wood 4.95 1.08 21.89 Wood
CCB 0.6 4.91 1.45 29.56 70%Adhe 4.09 0.90 21.95 Wood
CCBS 0.0 7.23 0.29 4.05 Wood 5.02 1.47 29.40 Wood
Cascophen
No 2.2 6.82 0.43 6.29 Wood 6.06 0.38 6.29 Wood
CCA 0.0 5.98 0.60 10.03 Wood 3.10 1.03 33.14 Wood
CCB 0.0 7.61 1.17 15.44 Wood 3.81 1.54 40.36 Wood
CCBS 0.0 7.06 0.93 13.11 Wood 3.39 0.08 2.26 Wood
Melamine
No 0.9 8.62 1.47 17.12 Wood 4.47 0.14 4.69 Wood
CCA 0.5 6.31 0.65 12.12 Wood 4.77 0.45 4.56 Wood
CCB 0.7 7.46 1.25 13.56 Wood 4.70 0.56 5.87 Wood
CCBS 1.0 9.89 0.98 11.22 Wood 4.50 0.23 4.56 Wood
Lyptus
Purbond
No 38.1 3.40 0.21 6.23 Wood 2.64 1.09 41.20 50%
CCA 7.6 5.45 0.82 15.03 70%Adhe 3.54 0.78 22.02 Adhe
CCB 4.7 3.13 0.49 15.80 Wood 1.66 0.37 22.06 50%
CCBS 7.2 3.61 0.92 25.35 70%Adhe 2.64 0.58 21.86 50%
Cascophen
No 38.6 4.10 0.98 23.95 Wood 2.03 0.59 28.87 50%
CCA 11.1 2.77 1.02 36.84 70%Adhe 1.21 0.39 31.99 Adhe
CCB 8.3 3.37 1.07 31.73 Wood 2.47 1.27 51.47 Adhe
CCBS 8.9 3.96 1.37 34.47 70%Adhe 2.54 0.00 0.04 50%
Melamine
No 23.2 6.88 1.11 17.25 Wood 3.71 1.14 23.35 50%
CCA 15.3 5.14 1.58 10.56 70%Adhe 5.88 1.86 26.65 Adhe
CCB 13.56 7.26 2.56 16.56 Adhe 5.61 2.56 16.65 50%
CCBS 25.5 5.56 3.52 15.75 50% 4.56 3.56 20.56 50%
Use Class The Pine Wood and Parica Wood was considered due a good behavior
for a use outside. The Wood of Teak with Adhesive Purbond presented good results
when analyzed humidity of 12%, but when saturated presented several anomalies in its coefficient of variation. Therefore use was classified as Inside. The same species with Adhesive Cascophen had a good performance much moisture as when 12% saturated and therefore was classified as outside use.
The Wood of Lyptus presented many anomalies both at 12% moisture as when saturated, has also presented various failure modes of the expected and therefore was classified as use Inside.
Conclusion
The proposed methodologies submitted for testing were
satisfactory for the classification of the class to use combinations
Adhesive species-preservative treatment.
It was also observed that the processing and handling of
materials and Adhesive species require a very strict quality control,
since these materials are very sensitive to variations in humidity,
temperature, time and pressure.
Conclusion The combinations performed which showed the best
performance was Wood of Pine with any adhesive type of treatment
or analyzed and can be thus used in order outside.
During the test the wood of Parica was attacked by termites ,
which the other woods that was in the same area was not, meaning
that Parica needs to be treated in order to have long time use.
The Wood of Lyptus, for any combination Adhesive-treatment, if
fitted to use class Inside.
The Wood of Teak can be used under Inside (Adhesive Purbond
and all kinds of treatment) or outside (Adhesive Cascophen and all
kinds of treatment).
thanks [email protected]
