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Physical and Mechanical Properties of Brandisii Bansh (dendrocalamus Brandisii)

M Akter Hossain
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chattogram, Bangladesh

M Arifur Rahman
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chattogram, Bangladesh

UK Rokeya
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chattogram, Bangladesh

M Mahabubur Rahman
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chattogram, Bangladesh

Abstract/ Executive Summary:

Physical and mechanical properties of Brandisii bansh (Dendrocalamus brandisii) has 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 the 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.

Keywords: Bamboo, Properties, Strength and Species

Location: Bangladesh Forest Research Institute, Chattogram.

Start Date:

End Date:

Program Area: Farming System

Commodity: Bamboo

Objectives:

To determined on the basis of green and ovendry volumes.

Methodology:

Brandisii bansh (Dendrocalamus brandisii) were collected from the bambosetum of the Bangladesh Forest Research Institute, Chattogram. Three bamboo culms of brandisii of three years old were studied. Three height positions, the bottom, the middle and the top were considered for each test. The size of the specimens for the determination of moisture content and specific gravity were 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 were also of 2.5 cm rings and for diameter shrinkage, the specimen consisted of the internodes of the culms bounded by nodes at the extremity. Three rings and three intermodal culms were cut from each of the height positions. Physical and Mechanical Properties Procedures and methods used for the determination of physical and mechanical properties of bamboo were referring to International Standard ISO 22157-1 and ISO 22157-2. Samples of 25 mm x 25 mm x wall thickness for both untreated and treated bamboo were taken near the failure place for the determination of moisture content and density. The bamboo was cut from each section of the culm (bottom, middle, top). The initial weight before drying was weighed. Then, the samples were dried in an oven at a temperature of 103 ± 2°C. After 24 hours, the mass was recorded. Mechanical properties, viz., compressive and static bending were carried out according to the Indian method (Anon, 2008). The size of the specimens for the static bending test was 75 cm in length bounded by two nodes. Paired specimens were prepared for each of the height positions, one for the test in green condition and the other for the test 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 height position for testing in green and air-dry 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 (Limaye 1952; Sattar et al 1990)

Source of Information: Eco-friendly Agril. J. 14(03):01-08, 2021 (March)

Article Link (Online Journal): http://efaj-international.com/

Funding Source:

Budget:

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 and modulus of rupture whereas Brandisii bansh (Dendrocalamus brandisii) and Baijja bansh (Bambusa vulgaris) exhibited the lowest value among the species.

Knowledge Management: Journal