Page 68 - ROHANA_Journal_No_11-2019-ok

Research Journal of the University of Ruhuna, Sri Lanka- Rohana 11, 2019

20 Clear Timber
COMPRESSIVE STRENGTH PERPNDICULAR TO 14 Specimen
18
16
4 GRAIN/(N/mm²)
Finger Jointed Timber
12
Specimen
10
8
6
2
0

TIMBER SPECIES
Source: Author compiled

Figure 11: Comparison of the average compressive strength perpendicular to
grain of different timber species

Compression of Specimens of Structural Scale

The compressive strengths of finger jointed specimens of Pine and Grandis, which
were of structural scale, got values of 80.29% and 72.58%, compared to clear timber

section, respectively. The test was also carried out on sections jointed with glue. The

test results reveal that the compression capacities of normal glue jointed Pine and
Grandis species are got values of 70.89% and 72.16%, compared to clear timber

section, respectively. Both test results indicate that there is no significant variation in
the ultimate capacity of both glued and finger jointed timber species. However, it is

recommended to carry out further tests on these species.

Conclusions

The study demonstrates the usefulness of finger jointed timber to utilize the timber

waste focusing structural applications. Therefore, mainly the strength capacities
under static bending and compression were analyzed for finger jointed timber with

the commercially available finger joint profile and adhesive in Sri Lanka and the
discussion is led to below conclusions.

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