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29 November 2022 | Story Leonie Bolleurs | Photo Leonie Bolleurs
UFS green concrete
The Department of Engineering Sciences (EnSci) welcomes collaborations with other departments at the UFS. Pictured here are, from the left: Louis Lagrange, Head of EnSci, Prof Kahilu Kajimo-Shakantu, Head of the Department of Quantity Surveying and Construction Management, Dr Abdolhossein Naghizadeh, and Megan Welman-Purchase, analytical scientist in the Department of Geology.

More than 30 million tonnes of fly ash (residue from coal combustion in power plants) are generated in South Africa annually, with 96% of that being disposed of in landfills. There is thus more than enough of this key ingredient to produce green concrete. 

Green concrete, so called due to its environmentally friendly benefits, is an eco-friendly alternative to conventional concrete based on the Portland cement binder. During the production of green concrete, less carbon dioxide is released into the atmosphere than with the production of ordinary Portland cement (OPC). The latter accounts for up to 8% of all global carbon emissions.

Successful tests

In the Green Concrete Lab, established in 2021 within the Department of Engineering Sciences (EnSci) on the Bloemfontein Campus of the University of the Free State (UFS), Dr Abdolhossein Naghizadeh, Senior Lecturer, researcher, and engineer, is working on green cement and concrete projects.

He uses ‘geopolymer’ technology and a mix of waste materials, alkaline solutions, and recycled aggregates to form concrete mixtures that can provide properties similar to conventional concrete.

Besides being a synthesised inorganic material (not a petrochemical product), the geopolymer cement he introduced has the following properties: it is made from a reaction between aluminosilicate materials and strong alkalis (5-7% of the concrete mixture), it uses water and by-products as raw materials, it does not calcinate lime, thus giving it a low carbon emission, and it is also beneficial from a waste management point of view. 

The waste materials used can include waste from industrial and agricultural sources, such as fly ash, rice husk ash, sugar-cane bagasse, or corncob ash, as well as natural materials such as volcanic ash. In South Africa, sufficient amounts of industrial and agricultural waste are available. 

“So far, we have successfully tested various types of green concrete based on different waste materials,” says Dr Naghizadeh. 

Besides researching the green mixture proportions in the lab, Dr Naghizadeh and his students focused their attention on establishing the strength, durability, workability, and production cost of the product. 

They compared green concrete with conventional concrete. Green concrete’s workability is slightly lower (but he believes that with appropriate mix design it can be corrected), and it has a much higher compressive strength (50-90 MPa), a smaller carbon footprint, and comparable production costs to conventional concrete (depending on the mix design). A very high level of resistance against alkali-silica reaction (concrete cancer) is also present, as well as resistance to carbonation, sulphate attack, and acid attack.
So far, we have successfully tested various types of green concrete based on different waste materials.– Dr Naghizadeh. 

He explains, “The superior durability performance of green concrete is related to its chemical compositions and microstructure. For example, the lack of calcium content in the composition provides better resistance to alkali-silica reaction. At the same time, stronger bonds between elements and polymeric microstructure provide better resistance against acids and fire.”

With all the work and research of the past year and a half, Dr Naghizadeh says they are at the stage where they can prescribe green concrete production recipes for the industry parties based on the specified application and the materials they have.

Biggest accomplishments

“We transferred most of the experimental works to the Green Concrete Lab at the beginning of 2022, which improved our productivity tremendously. Since then, nine journal papers and three peer-reviewed conference papers have been published as outputs of the research projects. Currently, there are also multiple publications under review or in the development stages,” says Dr Naghizadeh.

In addition to him, there are three master's students and one research associate working on their own individual projects.

The department is very proud of its research outputs. Dr Naghizadeh was either author or co-author of all 12 research papers. The focus of these papers was mostly on the formulation of green concrete, based on locally available agricultural waste materials, the formulation of one-part geopolymer cement (when aluminosilicate raw material is replaced with pre-activated aluminosilicate material, water can be used instead of alkali solution), and the development of ambient-cured green concrete (replacing the aluminosilicate raw material with a blend of materials).

Dr Naghizadeh is also the project leader of a group of scientists from local and international universities who are researching sustainable construction materials. These institutions include the Universities of Johannesburg, KwaZulu-Natal, Yaoundé in Cameroon, Erzurum Technical University in Turkey, as well as Nelson Mandela University and the Central University of Technology, which recently came on board. 

 


 


News Archive

Researcher transforms despair into diamonds
2016-01-18

PhD candidate, Lerato Machetela and some members of the group Diamonds in the Rough having some fun between rehearsals.

Awash in hopelessness, substance abuse, violence, and sexual promiscuity. This is the lived reality of the youth in Jagersfontein. But now Lerato Machetela is using her research to change it.

As a PhD candidate in Trauma, Forgiveness, and Reconciliation Studies at the University of the Free State (UFS), Machetela assembled a group of 14 young men – ranging between the ages of 9 and 18 – who call themselves Jagersfontein’s Diamonds in the Rough. Combining elements from psychology, education, and entertainment, Machetela has established a platform that grounds these young ones adrift in circumstances. By means of song and dance, these young ones have become grounded through creativity.

While discussing what it means to be free in the new South Africa, Machetela asked the group to come up with a song similar to the struggle song, ‘Nelson Mandela usi litheli ixolo’.

Jagersfontein’s Diamonds in the Rough Researcher, Lerato Machetela, combines psychology, education, and entertainment to ground local youths through creativity.

The result: He’s a teenager, but he drinks Hansa.

“This then developed into a dance routine depicting what the youth is doing with their freedom,” Machetela says. With each beat of their boots and rhythmic clap of their hands, the group illustrates the ways in which the youth has constructed – and come to understand – their daily realities. “The routine includes the expression of alcohol and drug abuse, and ends of with the importance of education.”

Through the creative expressions of Diamonds in the Rough, Machetela is able not only to explore the reality of the youth in Jagersfontein, but also to investigate intergenerational trauma. “I am looking at whether there is a relationship between these young people’s current circumstances and the experiences of their parents’ generation during the apartheid years. That is, what sort of meanings do they construct as young, black South Africans growing up in the new South Africa?”

What started off as a research project is now rippling beyond academic spheres, though. The Free State Department of Sport, Arts, Culture and Recreation has taken note of this initiative. As a result, the group has already performed at the Bloem Show, International Museums Day, and Heritage Day celebrations, as well as at the Mangaung African Cultural Festival (MACUFE).  

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