Green-mix concrete as an environmentally friendly building material

May 26, 2015, Universiti Teknologi MARA (UiTM)
Green-mix concrete as an environmentally friendly building material
Interest is growing in the development of environmentally sustainable concrete.

Complementing the Government of Malaysia's efforts to encourage the use of environmentally friendly materials in the construction of green buildings, researchers from the faculty of civil engineering, Universiti Teknologi MARA in Malaysia have successfully developed an environment friendly version of building concrete called green-mix concrete.

When it comes to building structures, developers and contractors have the advantage of choosing from a variety of materials to use. Generally, the decision on material choice depends on several factors including cost and performance for specific applications.

Due to growing interest in sustainable development and various incentives provided by the Government of Malaysia, the key players in the construction industry are motivated more than ever before to use materials that are sustainable or in such a way that their environmental impact is minimal.

In 2009, the Malaysian government launched the green building index (GBI) to encourage the construction of buildings using green technology, and introduced incentives for owners to obtain the GBI certificate for new or existing buildings. There have also been efforts to reduce and has an important role to play because a significant amount of the world's carbon emissions stem from cement and concrete production. Therefore, it is important to develop green concrete that can be used in buildings and structures.

In recent years, the application of green concrete has become popular in many countries including Malaysia. The innovative concrete can be produced using waste materials as one of its components. Green concrete can also be developed using various production processes that are not detrimental to the environment. The criteria for green concrete is that the materials used for making it should be sourced from sustainable or "green materials" rather than non-sustainable resources. The use of recycled or can be considered sustainable as they can lower costs and raw materials as well as reduce landfills.

In this project, researchers at Universiti Teknologi MARA introduced an innovative green concrete called "green-mix concrete" that is designed and manufactured using conventional materials but partially replaced with suitable waste and recycled materials to achieve acceptable performance, economics and sustainability. Green concrete is made of new raw materials - namely fly ash, recycled concrete aggregates and aluminium can fibres. Fly ash is a waste product from coal power plants and is commonly disposed of in ponds and sent to landfills. Through research it was discovered that fly ash has the potential to replace cement, a material with large environmental impacts due to air pollution from the cement plants. In order to reduce consumption of raw materials and to minimise the wastes generated from demolished concrete structures, crushed concrete can be reused as aggregates. Aluminium cans were used because they can be easily processed into chopped fibres and used as reinforcement in concrete.

To produce this new concrete requires technical expertise such as new concrete mix design, new raw and new knowledge of green concrete properties. Not only is this newly developed green concrete , it is also cost-effective as a result of optimized material proportions from our new concrete mix design. In our investigation, the new concrete can achieve an increase in strength of up to 30% compared to normal concrete.

In conclusion, our green concrete has the following benefits:

  • made using low cost and sustainable ;
  • designed for strength and performance during service-life of buildings or structures;
  • contributes to GBI score;
  • has lower cement/carbon footprint per unit of concrete produced;
  • reduces, reuses and recycles industrial by-products targeted for landfills; and
  • has potential for commercialization by providing developers and contractors with an alternative concrete that is environmental-friendly, in line with the National Green Technology Policy.

Explore further: Experts propose research priorities for making concrete 'greener'

Related Stories

Natural nanocrystals shown to strengthen concrete

March 31, 2015

Cellulose nanocrystals derived from industrial byproducts have been shown to increase the strength of concrete, representing a potential renewable additive to improve the ubiquitous construction material.

Limestone powder enhances performance of 'green' concrete

September 4, 2013

Adding limestone powder to "green" concrete mixtures—those containing substantial amounts of fly ash, a byproduct of coal-burning power plants—can significantly improve performance, report researchers from the National ...

The aesthetic appearance of concrete is controversial

February 25, 2015

Is a perfect concrete wall concrete without big pores? The aesthetic appearance of concrete is a controversial subject among developers, architects and building contractors. What does look like anyway? What is it that makes ...

Recommended for you

Archaeologists discover Incan tomb in Peru

February 16, 2019

Peruvian archaeologists discovered an Incan tomb in the north of the country where an elite member of the pre-Columbian empire was buried, one of the investigators announced Friday.

Where is the universe hiding its missing mass?

February 15, 2019

Astronomers have spent decades looking for something that sounds like it would be hard to miss: about a third of the "normal" matter in the Universe. New results from NASA's Chandra X-ray Observatory may have helped them ...

What rising seas mean for local economies

February 15, 2019

Impacts from climate change are not always easy to see. But for many local businesses in coastal communities across the United States, the evidence is right outside their doors—or in their parking lots.

The friendly extortioner takes it all

February 15, 2019

Cooperating with other people makes many things easier. However, competition is also a characteristic aspect of our society. In their struggle for contracts and positions, people have to be more successful than their competitors ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.