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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

KovsieSport celebrates three varsity tournaments' titles
2015-04-21

Both staff and students celebrated the Shimlas, KovsieTennis, and KovsieNetball’s achievements.
Photos: Hannes Pieterse

 

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In this week of graduation ceremonies, the University of the Free State had more than its academic achievements to celebrate. The Shimlas’ brilliant triumph in the Varsity Cup as well as the achievements by KovsieTennis and Kovsie Netball was celebrated at a colourful event on the Bloemfontein Campus.

At the celebrations, which were well supported by the campus community, the Vice-Chancellor and Rector, Prof Jonathan Jansen, congratulated all three teams on their outstanding achievements. Not only did the Shimlas walk off with the Varsity Cup, they also won every game they played. AJ Coertzen, the Shimlas’ captain, said: “Although we were well prepared and physically fit, the fact that we played for one another contributed much to our success. As a team, we have grown from friends to brothers.”

KovsieTennis was congratulated on wearing the USSA tennis crown for the fourth consecutive year. In addition, they have the following triumphs to their name: 2007 – SASSU (South African Students Sports Union) (Ladies); 2008 – USSA (University Sport South Africa) (Ladies) and 2009 USSA (Men). Duke Munroe, captain of the KovsieTennis team took the opportunity to thank the team personnel. He believes that hard work behind the scenes by the coach, Marnus Kleinhans, and the team manager, Janine de Kock, contributed greatly to the team’s success.

KovsieNetball was also praised for their successes. In 2014, under the captaincy of Karla Mostert, they won gold at the Varsity Netball championships. They also won the National Premier League. The UFS is also proud of its netball players in various national teams: SA Under 19-23, the Protea groups, and the SA University team.

At the celebrations, Karla said: “The environment and the people you surround yourself with dictate how easily you achieve success. Our achievements and successes are evidence of the quality of the coaches, supporters, and facilities available to us.

After the event on the Red Square, the teams made an appearance in the Callie Human Centre, where they were enthusiastically congratulated by graduands, their families and the university management. Dr Khotso Mokhele, Chancellor of the UFS, also praised the teams for their achievements. “You are a team without individual stars. That is the sort of team I want to be part of.”

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