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Can Bamboo be used as concrete reinforcement? Being the member of wood family, is it possible for bamboo to be used as cocnrete reinforcement?

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Bamboo is not stronger than steel reinforcement, steel and concrete are bonded to each other, so after all inventions steel is best material for reinforcement for concrete


Bamboo as Concrete Reinforcement
Yes Bamboo can be used and it has been in use previously. Wood is also strong in tension and bamboo has a lot of tensile strength. Following are some points to be considered for using bamboo in concrete.
Factors to be considered for using bamboo as Concrete reinforcement
The following factors should be considered in the selection of bamboo  culms (whole plants) for use as reinforcement in concrete structures:

  1. Use only bamboo showing a pronounced brown color. This will insure that  the plant is at least three years old.
  2. Select the longest large diameter culms available.
  3. Do not use whole culms of green, unseasoned bamboo.
  4. Avoid bamboo cut in spring or early summer. These culms are generally weaker  due to increased fiber moisture content.

The same mix designs can be used as would normally be used with steel  reinforced concrete. Concrete slump should be as low as workability will  allow. Excess water causes swelling of the bamboo. High early-strength  cement is preferred to minimize cracks caused by swelling of bamboo when  seasoned bamboo cannot be waterproofed.
Design & construction Principles
Bamboo reinforcement should not be placed less than 1-1/2 inches from  the face of the concrete surface. When using whole culms, the top and bottom  of the stems should be alternated in every row and the nodes or collars,  should be staggered. This will insure a fairly uniform cross section of  the bamboo throughout the length of the member, and the wedging effect  obtained at the nodes will materially increase the bond between concrete  and bamboo.
The clear spacing between bamboo rods or splints should not be less  than the maximum size aggregate plus 1/4 inch. Reinforcement should be  evenly spaced and lashed together on short sticks placed at right angles  to the main reinforcement. When more than one layer is required, the layers  should also be tied together. Ties should preferably be made with wire  in important members. For secondary members, ties can be made with vegetation  strips.
Bamboo must be securely tied down before placing the concrete. It should  be fixed at regular intervals of 3 to 4 feet to prevent it from floating  up in the concrete during placement and vibration. In flexural members  continuous, one-half to two-thirds of the bottom longitudinal reinforcement  should be bent up near the supports. This is especially recommended in  members continuous over several supports. Additional diagonal tension reinforcement  in the form of stirrups must be used near the supports. The vertical stirrups  can be made from wire or packing case straps when available; they can also  be improvised from split sections of bamboo bent into U-shape, and tied  securely to both bottom longitudinal reinforcement and bent-up reinforcement.  Spacing of the stirrups should not exceed 6 inches.
Table I. Mechanical properties of bamboo reinforcement

Mechanical PropertySymbol

Value (psi)

Ultimate compressive strength 


Allowable compressive stresss


Ultimate tensile strength 


Allowable tensile stresss


Allowable bond stressu


Modulus of elasticityE


Bamboo As The Building Material


More related Links



http://www.bambubrasileiro.com/arquivos/Bamboo Reinforcement Concrete - Ghavami - 2004.pdf



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