Bamboo reinforcement

A power-point presentation on Bamboo Reinforcement.

1. BAMBOO REINFORCEMENT By: Miss. Rucha Sane (B.E. Civil)

2. INTRODUCTION Developing countries have the highest demand for steel reinforced concrete, but often do not have the means to produce the steel. In recent years, many researchers around the world are begun to explore the use of low-cost and low-energy substitute construction materials. Among the many possibilities for such substitutions, B amboo , which is one of the fastest growing plants, has got a great economic potential. Bamboo has been used in constructions of bridges and houses for thousands of years in Asia. Right now, very few people are using bamboo in place of steel for reinforcement, but bamboo could be an excellent choice for reinforcement in concrete.

3. COMPARISON BETWEEN BAMBOO & STEEL PROPERTY BAMBOO (kN/sq.cm) STEEL (kN/sq.cm) Modulus Of Elasticity 2000 21000 Compressive Strength 6.2 – 9.3 14 Tensile Strength 14.8 – 38.4 16 Bending Strength 7.6 – 27.6 14 Shear Strength 2.0 9.2

4. SELECTION OF BAMBOO The following factors should be considered in the selection of bamboo for use as reinforcement in concrete structures: Use only bamboo showing a pronounced brown color. This will insure that the plant is at least three years old . Select the longest large diameter culms available. Do not use whole culms of green, unseasoned bamboo. Avoid bamboo cut in spring or early summer. These culms are generally weaker due to increased fiber moisture content.

5. HOW TO PROTECT BAMBOO… ….to avoid this, one effective treatment is The application of thin layer of epoxy to the bamboo surface followed by a coating of fine sand .

6. CONCRETE MIX PROPORTIONS The same mix designs can be used that are normally used with steel reinforced concrete. Concrete slump should be as low as workability will allow. High early – strength cement should be preferred to minimize cracks caused by swelling of bamboo in case if seasoned bamboo is not water – proofed.

7. PLACEMENT OF BAMBOO Bamboo reinforcement should not be placed less than 1 ½ inches from the face of the concrete surface. The clear spacing between the bamboo rods should not be less than the maximum size aggregate plus ¼ inch. Reinforcement should be evenly spaced & lashed together on short sticks placed at right angles to the main reinforcement. The ties can be made with vegetation strips. Spacing of the stirrups should not exceed 6 inches.

8. Column reinforcement Details Final product

9. Setup of Bamboo Reinforced Slab

10. Bamboo Beams Strip Footing Single Post Footing

11. ADVANTAGES Strength : Strong naturel fiber, when cultivated, harvested, prepared & stored properly. Flexibility : Due to its flexible nature, it can be used for archways & other curved areas. Earthquake resistance : High shock absorption makes it particularly useful in earthquake – prone areas.

12. Prototype House built with bamboo sheet roofing & bamboo reinforced concrete walls withstood a simulated earthquake measuring 7.8 on Richter sacle . A bamboo house in Bhutan that withstood an earthquake that occurred at Sikkim (epicenter) measuring 6.9 in September 2011.

13. Lightweight : Building with bamboo can be accomplished faster than building with other materials. Cost effective : Especially in areas where it is cultivated & readily available. Durable : It is long lasting when properly harvested & maintained.

14. LIMITATIONS OR DRAWBACKS Following few considerations currently limit the use of bamboo as a universally applicable construction material: Jointing techniques : Although many traditional joint types exist, their structural efficiency is low. Considerable research has been directed at the development of more effective methods. Flammability : Bamboo structures are not fire resistant & the cost of treatment. Splitting : Low strength along the fibers causes it to split or crack.

15. Lack of design guidance & codification : The engineering designs of bamboo structures has not yet been fully addressed. There is a little or no data containing specifications of bamboo.

16. CONCLUSION Based on the research results of bamboo obtained in universities & other institutes around the world, the first norms for bamboo were created by determining the physical & mechanical properties of bamboo. These norms have been evaluated by International Code Council & will be included in the ISO norms in near future.

17. The results of the investigation show that bamboo can substitute steel satisfactorily . There is a need to introduce formal education on the use of bamboo as a structural material in design & technical school.

18. T h a n k Y o u … ! ! !