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23 June 2021 | Story Leonie Bolleurs | Photo Supplied
The Department of Engineering Sciences (EnSci) – under the leadership of Dr Abdolhossein Naghizadeh – is heading a collaboration of scientists to create a green concrete that will reduce the impact of cement on the environment.

Conventional cement production is responsible for more than 6% of the overall carbon emissions in the world, which ultimately affects global warming.

The Department of Engineering Sciences (EnSci) at the University of the Free State (UFS) – under the leadership of Dr Abdolhossein Naghizadeh – is heading a collaboration of scientists from universities in South Africa and abroad to create a green concrete that will reduce the impact of cement on the environment.

This product has the potential to be used as an alternative to conventional concrete in large-scale constructions such as residential buildings and infrastructure, as well as small-scale constructions such a pavements and brickworks. 

Dr Nagizadeh, whose passion is cement and green concrete, says the idea of eco-friendly concrete was considered by European researchers a few years ago; however, this technology is still in its initial stages and has not been researched and employed at industrial scale yet. He believes that it is due to the complexity of the preparation process, and the relatively aggressive chemicals used in green concrete mixtures.

Expertise and equipment 

With his knowledge and experience of the product, Dr Naghizadeh – who joined EnSci in 2020 – has been appointed project leader of a collaborative group of scientists from the Universities of Johannesburg, KwaZulu-Natal, Yaoundé in Cameroon, and the Erzurum Technical University in Turkey.  

“Since there are only a limited number of researchers in this field, EnSci is benefiting from the expertise of this international collaboration. The proficiency of this group of scientists are keeping the project current, based on the latest findings in the research area,” says Louis Lagrange, Head of the Department of Engineering Sciences. 

Based on this new capacity, the department decided to establish and equip a new laboratory facility dedicated to cement and concrete research, with a specific current focus on green concrete. 

In this laboratory, they want to create formulations of green concrete, based on user-friendly materials. Furthermore, they aim to simplify the preparation and mixing process. “This can introduce a more eco-friendly, desirable product that can easily be employed extensively in the construction industry,” says Lagrange.

Benefits and other advantages

Besides its ability to reduce the impact on the environment through reduced carbon emissions, the product is also described to perform at equal or even superior strength and durability compared to conventional concrete, with potentially substantial environmental and economic benefits. 

This product is also primarily made from waste materials or industrial by-products. Dr Naghizadeh explains it as follows: “Normal concrete consists of conventional (Portland) cement, sand, stone and water, while in green concrete the conventional cement part of the concrete mix is replaced by industrial wastes or by-products and alkali solutions. These alternative materials are mostly aluminosilicate materials such as fly ash (residue from coal burning process in power plants) and slag (waste material from iron extraction processes).”

“Using these waste substances as binding material in green concrete can, apart from the environmental benefits, also reduce waste and contribute to the circular economy. Annually, more than 36 million tons of fly ash are produced in South Africa alone, of which more than 90% is deposited at landfill sites. Reuse of these waste materials will moderate the related waste deposition issues, such as air and groundwater pollution.”

Production of green concrete

Currently, green concrete is mostly produced in two parts: a solid raw material and an alkali activation solution. With their project, the research group wants to develop green concrete in a powdered form, to be mixed with water, instead of a chemical. Dr Nagizadeh estimates that the construction industry will be able to benefit from their work in about two years’ time when they will have a user-friendly green concrete product ready. 

Apart from putting an eco-friendlier concrete on the market, this project is also establishing a brand-new research niche in the UFS Department of Engineering Sciences. According to Lagrange, this research has the ability to attract postgraduate students and other researchers. He is also looking forward to the international academic recognition that EnSci will receive through published articles in leading international journals, and the participation of researchers in accredited conferences arising from this project. 

Lagrange is pleased that the project is establishing EnSci as a research player of note in the engineering field, specifically in the green engineering field. 

News Archive

Social work students off to Sweden on exchange programme
2015-08-17


Excited about the prospects of studying in Sweden, Letttie and Moratoe already have their bags packed. Photo: Valentino Ndaba

In 2011 the university signed an exchange programme agreement with Jönköping University (JU), in Sweden. Since the inception of the contract the UFS Department of Social Work has been able to send two second year students to the guest university for a semester annually while also hosting students from JU.

 

The UFS is one of only 350 partner universities that JU co-operates with on an international level. The university that describes itself as “the most international university on Sweden” welcomes 714 exchanged students annually. This year, their School of Health and Welfare will host two of our Social work students, Moratoe Tshabalala and Lettie Mohoko; who are the fourth duo to take this unique opportunity.

These Kovsies will join the JU from 17 August-20 December 2015. By focusing on Swedish Social work and welfare policy, participation and inclusion, and Old-age care, they intend to use the learning experience to influence our country’s welfare system.

Growing up in Wesselsbron - a small town in the Free State, Lettie has always been passionate about working with people and having a positive impact on their lives. She sees the exchange programme as an opportunity to gain an international perspective which will provide more skills, hence improving her community engagement.

Moratoe, who is from the small town of Senekal, echoed similar sentiments, adding that she is interested in the distinctiveness of Sweden’s social welfare system, which offers free education, where old people get free care from the government, and children get incentives to attend school.

Lettie and Moratoe also volunteer as representatives of the UFS at ENGO Family Care, a non-profit organisation in Bloemfontein.

Dr Anneline Keet, Head of the UFS Social Work Department, believes that the exchange experience enhances the students’ critical thinking, and facilitates their ability to engage with different social welfare systems. While only two students are able to experience the full exchange annually, the rest of the students also benefit from the discussions taking place in class where students from the guest university (JU) join them for a semester.

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