Investigation of the Flexural and Bond Strengthes of Bamboo Using Different Splits (Forms) in Cocrete Members
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Date
2010-03
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Addis Ababa University
Abstract
This study presents the evaluation of the feasibility of the use of bamboo as
reinforcement in concrete members. To achieve this objective a series of tensile,
compression, pullout and flexural tests are carried on Gumero bamboo species collected
from Gurage zone SNNPS. The tests were prepared and performed in accordance with
the standard procedure established in ISO-22157, ASTM and other related references.
The results for the tensile test indicated that the tensile strength of the bamboo species up
to 149.5N/mm2 has been recorded and failure of the tensile samples occurred at the
nodes. Similarly, the compression test indicates that the compression strength of the
bamboo species up to 44.17N/mm2 are obtained and failures of the compression samples
were initiated primarily due to splitting and end brooming. The compressive strength was
found to be much less than the tensile strength. This confirmed the fact that bamboo fiber
grows in the longitudinal direction and it has less resistance in the transverse direction.
On the other hand pullout test were conducted for untreated full , half, quarter sections
and treated quarter section. From the test result the treated quarter sections have a
slightly better bond strength than the untreated quarter section. Moreover, the untreated
quarter sections have more bond strength than the untreated half and full sections.
Further, the node helps the bamboo in the reinforcement to have a bearing action .
Flexural tests were also made for 2.5%, 3.5%, 4.5% and treated 2.5% as percentage of
bamboo to net concrete area. From the experimental result beam specimens with bamboo
concrete ratio of 4.5%, sustained greater load than those specimens with 2.5 and 3.5
percentages. Furthermore, beam specimens with 3.5% sustained greater load than beams
with 2.5 percentages. With this intention the carrying capacity of bamboo reinforced
beam was maximized by increasing the percentage of bamboo reinforcement.
Comparison with minimum steel reinforced concrete and equivalent stress steel
reinforced concrete was made. It was obtained that the 2.5 % bamboo had ultimate load
resistance by more than 20% than the minimum steel reinforcement. It was also shown
that the ultimate load capacity of bamboo was about 45% equivalent steel reinforced
concrete beam.
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Strengthes