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An Investigation on Strength and Economy of Cement Plastered Bamboo-mat as Fence of Rural Houses.

Dr. Md. Zainul Abedin
Professor
Department of Farm Structure, Bangladesh Agricultural University, Mymensingh-2202.

Md. Zillur Rahman
Lecturer
Department of Farm Structure, Bangladesh Agricultural University, Mymensingh-2202.

Abstract/ Executive Summary:

The study attempts to explore the feasibility of using cement-plastered Bamboo-mat as Fence of Rural Houses. The strength properties of three common species of Bamboo Borak, Morol and Jay were determined experimentally using their splits as test specimen. The Model fence slabs of size 90×30×5 cm were fabricated with coal-tar coated fence-skeletons made from splits of the selected three different bamboo species having rectangular cross-sections of about 13×10 mm and cement mortar of ratio 1:4, 1:5 and 1:6. The load bearing capacity and the structural rigidity of the model slabs were determined against flexural and impact loadings. The load carrying capacities of the slabs were evaluated in terms of the thrust resulting from the devastating wind speed of 300 km/hr beyond great danger signal No. 10 of weather forecast. The structural rigidity of the slabs were characterized in terms of their resistance against the dropping heights of impact loading. Among the bamboo species tested, the splits of Jay possessed the highest tensile strength of 219.5 N/mm² which is about 50% of the tensile strength of mild steel rod and on the contrary, the splits of Morol species carried the highest compressive strength of 100.3 N/mm². Among the bamboo-reinforced slabs tested, the slabs with splits of Jay species carried the highest ultimate loads at different cement mortar ratio. The slabs with Jay species and 1:6 cement mortar ratio was capable of withstanding 22.78 KN/ m²lateral pressure and strong enough in resisting the wind speed up to 692 km/hr having 5.3 factor of safety. The slabs with splits of all the selected bamboo species yields adequately rigid against impact loading without registering any imprints within minimum dropping height of about 1.5 metre. Based on existing market prices of the cost items, the unit construction costs of bamboo-reinforced slabs were evaluated to be Tk. 228, 216 and 209 per square metre for the cement mortar ration of 1:4, 1:5 and 1:6 respectively. This cost is comparable and is only about 40-45% of the construction cost of 5 inch thick conventional brick wall.

Keywords: Bamboo, Bamboo-made-fences, Cement-plastered

Location: Department of Farm Structure, BAU, Mymensingh.

Start Date: 01-09-2004

End Date: 31-08-05

Program Area: Socio-economic and Policy

Commodity:

Objectives:

1. To determine the mechanical properties like tensile and compressive strength, torsional strength, elastic modulus and deformation characteristic of local bamboo of varieties Borak, Mahal and Muli etc. 2. To fabricate prototype fences with bamboo-splits and cement mortar of varying ratio. 3. To ascertain the rigidity of the prototype fences against impact flood and wind speed and; 4. To analyze the economic feasibility of bamboo-made fences.

Methodology:

a. Locally available three varieties of bamboos like Borak, Mahal and Muli, about three years of maturation will be bought from the local market and will be cut into small pieces. Because of the variation in properties along the length of bamboo may occur, therefore, three sections, Bottom, Middle and Upper will be selected for the tests. i. Tension and compression test, ii. Torsion test, iii. Fabrication of prototype fence, iv. Testing of fence strength, and v. cost analysis.

Source of Information: Bangladesh Agricultural University Research Progress, Volume 17, Proceedings of the Workshop 03-04 December 2006, Bangladesh Agricultural University Research System (BAURES), Mymensingh, Bangladesh.

Article Link (Online Journal):

Funding Source:

1.	Budget: 75000

Total Budget (Tk.) : 75000

Achievement/Findings:

The experiment of the results suggest that the slabs reinforced with 13×10 mm rectangular bamboo splits with 1:6 cement mortar ratio can be used satisfactory as a structurally strong and functional low cost fence elements for rural houses with expected life of about 35 years under controlled conditions.

Knowledge Management: Report/Proceedings