The Bamboo Revival: Green Structures 8

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Thursday, March 12th, 2015
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Bamboo is one of the world’s oldest structural materials and has been used in construction for centuries. Now new research could potentially bolster its continued resurgence and use as a material in green structures.

Steel-reinforced concrete is the most common building material in the world. Developing countries use close to 90 per cent of the cement and 80 per cent of the steel consumed by the global construction sector.

According to research by the chair of architecture and construction at Future Cities Laboratory (FCL) in the Singapore-ETH Centre, 70 per cent of damage in the built environment today is caused by corrosion of steel inside reinforced concrete structures. In addition, steel is also costly and energy hungry when it comes to production and transportation.

Very few developing countries have the ability or resources to produce their own steel or cement, forcing them into an exploitative import-relationship with the developed world. Out of 54 African nations, for instance, only two are producing steel. The other 52 countries all compete in the global marketplace for this ever-more-expensive, seemingly irreplaceable material.

Bamboo is now being touted as a possible alternative in reinforcement.

The research is exploring the creation of a bamboo composite material, which is corrosion-free, lighter and more affordable than steel and comes from a renewable, organic resource.

Bamboo is an incredibly rapidly-growing grass with outstanding constructive qualities. It is enormously resistant to tensile stress. In principle, bamboo, with regard to its mechanical-technological properties, is superior to timber and even to construction steel in terms of its live load to dead weight ratio.

“Bamboo has long been recognised in many building traditions around the world for its outstanding mechanical and physical properties. Recent concerns for environmental sustainability have seen the material being reassessed for application in mainstream building construction. It has even been described as the super-fibre of the 21st century. Bamboo is the fastest growing plant on earth, is self-regenerative, easy to obtain and therefore is very inexpensive,” said Alireza Javadian,  Doctoral Researcher from the FCL chair of architecture and construction.

“For a common oak or pine tree, a time frame of 30 to 70 years is necessary so that the plant is grown to its full strength before it is cut into any structural elements, while bamboo needs only four to five years to be ready for application for structural purpose. Therefore the interest in bamboo is increasing over the last decade and countries like China, Brazil and Columbia are already replacing many of their conventional timber-made products with high quality, inexpensive bamboo.”

Despite its strengths, bamboo has a number of weaknesses as a construction material. Water absorption, swelling and shrinking behavior, limited durability, and vulnerability to fungal attacks have limited most applications of bamboo so far.

Today, bamboo is generally limited to traditional applications of the culm as a structural component in vernacular architecture. Early attempts to use it as an untreated, non-composite reinforcement material in concrete were not successful. The technology to improve the material hasn’t been developed yet, probably because most countries with major bamboo resources are in the world’s developing regions and have little, if any, industrial capacity.

The newly established Advanced Fibre Composite Laboratory at FCL in Singapore allows the research to be extended in four different areas and scales: material production, property analysis, chemical composition, and micro imaging.

Testing in the Advanced Composite Laboratory Image credit: Future Cities Laboratory

Testing in the Advanced Composite Laboratory
Image credit: Future Cities Laboratory

The research is centred round the possibility of extracting the fibre from the natural bamboo, transforming it into a manageable industrial product, and introducing it as a viable building material and an alternative to steel and timber.

“Bamboo composite material can be produced in any of the familiar shapes and forms in which steel and timber are produced. Like them, the material can be used to build wall structures for houses or any other buildings. More interestingly, it can be used for specific applications that best take advantage of the material’s tensile strength, such as reinforcement systems in concrete or beams for ceilings and roof structures,” said Javadian.

Last year HSBC partnered with JWT Canada for “Bamboo City,” an exhibit at Toronto Pearson International Airport that promoted bamboo to replace steel in buildings.

The 3D installation consisted of a city of 117 buildings built using 1,264 stalks of bamboo. It took 3,600 hours to build and was promoted with the tagline, “In the future, we will be planting cities.”

Cleverly hanging above the city, a mirror reflected the installation below with its own tagline: “In the future, we will grow a new world economy.”

From above, Bamboo City is actually a globe, insinuating the use of bamboo will change the world.

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Discussions
8
  1. Thomas A. Peterson

    Possibly, but definitely sounds like some bugs need to be worked out much more testing needs to be done.

    My only concern with what was discussed was the idea of making the bamboo into a composite material. That often takes time and energy as well as some possibly toxic bonding agents. I under stand from what a former LEED advocate in Chicago told me, bamboo flooring requires a lot of heat and toxic glues to formulate the end product – – so much so that it is not really a green product at all.

  2. Jean-Paul Boudreau

    Very interesting!

  3. Roy Barrett

    I agree with the potential benefits to be achieved from wider use of bamboo in construction – particularly given its rapid re-growth compared to other timbers – and the technologies to overcome its few drawbacks look very promising for future laminated timber applications.

  4. Harris Tiddens

    Bamboo is powerfull. China is very active in this area.

  5. Laurent Puissant

    yep so far that it must be an emergency to replace iron nars by some bamboo inside.. fast growth and easy modeling, there are so many ways to use bamboos in contemporary structures, .. why not ? .. hey think about old metal industries for monopolies till now… As so many parts of society are just oldies in near dying, but keep on zomby work flows…

  6. Peter J. Francis

    Fabulous potential for this flexible green material. Latin America and the Caribbean are working on mainstreaming it. My concerns are around increasing the pest resistant and fire resistant properties.

    • Ghani Zaman

      BAMBOO can be made totally pest/ insect free. It can last 100's of year with the minimum maintenance. Need help contact me.

  7. Thilina Kiringoda

    It is always better to construct buildings with material which the mother earth can receive without protest at the end of their life cycles.