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Physical and Mechanical Properties of Four Bamboo Species

M.F. Kabir
Research Officer (Ex)
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chittagong.

M. A. Sattar
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chittagong.

D. K. Bhattacharjee
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chittagong.

Abstract/ Executive Summary:

Physical and mechanical properties of kali (Oxytenanthera nigrociliata), mitinga (Bambusa tulda), bethua (Bambusa polymorpha) and barak (Bambusa balcooa) have been studied at three different height positions along the culm. These properties were found to vary significantly along the culm height. The moisture content, shrinkage and bending strength decreased as the height increased, but the specific gravity, compressive strength and modulus of elasticity increased with the height. Variations of these properties were also found significant among the species. Borak bamboo exhibited the highest specific gravity and bending strength while mitinga showed the highest value in respect of compressive strength and modulus of elasticity.

Keywords: Physical and mechanical properties, Kali, Mitinga, Bethua, Barak

Location:

Start Date: 00-00-0000

End Date: 00-00-0000

Program Area: Conservation and Biodiversity

Commodity: Bamboo

Objectives:

To study the physical and mechanical properties of four Bamboo species

Methodology:

Four bamboo species, viz., kali (Oxytenanthera nigrociliata), mitinga (Bambusa tulda), bethua (Bambusa polymorpha) and barak (Bambusa balcooa) were collected from the bambosetum of the Bangladesh Forest Research Institute, Chittagong. Five bamboo culms of each species of three years old were studied. Three height positions, the bottom, the middle and the top were considered for each test in each species. The size of the specimens for the determination of moisture content and specific gravity were of 2.5 cm rings from each height position. The specific gravity was determined on the basis of green and oven dry volumes. The specimens for shrinkage in wall thickness was also of 2.5 cm rings and for diameter shrinkage the specimen consisted the internodes of the culms bounded by nodes at the extremity. Three rings and three internodal culms were cut from each of the height position.

Mechanical properties, viz., compressive and static bending were carried out according to the Indian standard (IS : 6874-1973). The size of the specimens for the static bending test was of 75 cm length bounded by two nodes. Paired specimens were prepared for each of the height position, one for the test in green condition and the other for the test in air dry condition. The modulus of elasticity and the modulus of rupture were evaluated from this test. The compressive stress parallel to grain was determined from the specimens on full diameter and the length was ten times of the average wall thickness of the culms. Paired specimens were also prepared from each of the height position for testing in green and airdry conditions. All the tests were conducted with bamboos of three years old because it was found in previous studies that bamboos like muli, borak and also other species mature at the age of three years.

Source of Information: Bangladesh Journal of Forest Science, Vol : 20 (1 & 2), Jan-July 1991, 31-36

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Specific gravity, compressive strength and modulus of elasticity increased and moisture content, shrinkages and modulus of rupture decreased along the culm height of bamboo.Except the shrinkage, the physical and mechanical properties varied significantly among the species.Borak bamboo showed the highest specific gravity whereas kali exhibited the lowest value among the species. Bethua bamboo was inferior to mitinga, kali and borak bamboo in respect of modulus of elasticity.

Knowledge Management: Journal