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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

Judge Ian van der Merwe unanimously re-elected as Chairperson of the UFS Council
2012-11-29

 
Judge Ian van der Merwe
Photo: Rian Horn
29 November 2012

The Council of the University of the Free State (UFS) unanimously re-elected Judge Ian van der Merwe as its Chairperson for the next three years at its last meeting for this year on Friday, 16 November 2012.

Judge Van der Merwe is a Judge of the Free State High Court. He is an alumnus of the UFS and has been a member of the Council since 9 March 2007.

In accepting his appointment, Judge Van der Merwe said that he was honoured and humbled to lead a Council of this calibre for a second term. “The Council is setting a good example of what good governance at a higher education institution should look like. Meetings are conducted in good spirit and decisions made in the best interest of the university,” he said.

“Having sat on councils of many universities before, I can say with great surety that, on balance of expertise and backgrounds, the UFS has one of the most effective councils in the country and, to have a Chairperson of Judge Van der Merwe’s stature, is a privilege. His leadership and guidance is greatly appreciated,” said Prof. Jonathan Jansen, Vice-Chancellor and Rector.

Mr Edward Kieswetter, Group CEO and Executive Director of Alexander Forbes and Deputy Chairperson of the UFS Council, and Mr Jonathan Crowther (former editor of Volksblad) have been re-elected for a further term of four years in the category: "Appointed by the Council".

External Council members were given a tour of the Bloemfontein Campus after the meeting, followed by an induction session for new council members.

New Council members who joined this year are: 

Derek Foster, in the category appointed by the Council
Ruben Gouws, elected by the non-academic staff
Lorraine Kriek, elected by the Alumni
Themba Mmabi, representative of the Minister of Higher
Education and Training
Sabelo Khumalo, SRC President, Qwaqwa Campus
William Clayton, SRC President, Bloemfontein Campus
Suraya Jawodeen, representative of the Minister of Higher
Education and Training
Mr Dan Mosia, representative of the Minister of Higher Education and Training
 

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