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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

“My time at the UFS was the golden gem of my career”
2016-07-04

Description: Zig Gibson Tags: Zig Gibson

Prof Alan St Clair Gibson
Photo: Oteng Mpete

“My time at the University of the Free State (UFS) was the golden gem of my career. I have worked at medical schools or biomedical research centres in the United Kingdom, United States and at some of the top medical schools in South Africa, but working at the UFS was one of the highlights of my career,” says Prof Alan St Clair Gibson, Head of the UFS School of Medicine.

After spending just over two years at the UFS, Prof St Clair Gibson resigned from the institution in June 2016 and will take up the position of Dean: Health and Human Performance Sciences at the Waikato University in New Zealand in mid-July, where he will assist to establish a new faculty for all the health-science disciplines. “It was a privilege to work at the UFS. I come from a strong research background and wanted to grow research at the university, which I achieved. I came to the UFS because of the Academic and Human Projects and am proud of what has been achieved at the School of Medicine during the time I was here,” he said.

Prof St Clair Gibson highlighted some of these achievements, including the development of a management infrastructure across the disciplines of the school. “The establishment of an executive management committee for the school, as well as research champions in departments, highlighted the importance of proper governance and strategic management. By developing data dashboards, my management team and I could develop an understanding of research income and productivity, how the school works, what the role of teaching and learning is, and how the school could benefit in terms of third-stream income from the many contracts obtained by its academic staff. As a result, contracts and the financial management model of the school have also been reconfigured to the benefit of the university so that the institution and school can benefit from it,” he said.

His strong belief in an open-door policy has made staff feel part of the environment and it has created an atmosphere of equality and inclusivity. He believes in staff development and has, for instance, established leadership and management courses for heads of departments. Another factor to be proud of is the increase in the number of young researchers who recently joined the school, such as Prof Ross Tucker, who is one of the foremost sport scientists in the country. “It is a fact that staff retire or resign in all schools and departments of any university. It is also true that these departures offer opportunities to bring new academic and professional staff into the UFS. In fact, for the first time virtually every department in the School of Medicine now has a full-time Head of Department and 46 new staff were appointed since January 2015,” said Prof St Clair Gibson.

“I am especially proud of contributing, together with the senior leadership of the UFS, to stabilise the relationship with the Free State Department of Health (DoH). With the assistance of these parties, as well as my executive management team, we could find a better way of working together to the benefit of the school and the province.’’

Transforming the student profile to be representative of the country’s demographics is another milestone Prof St Clair Gibson will remember. “The intake of black and white students is of such a nature that we now have a much more balanced ratio of black and white undergraduate students than before.”

“I wanted to stay longer to see the effect of all the changes I made at the school, but the deanship is an offer I cannot refuse. I would have liked to see a steadier increase in the number of permanent clinical staff and have worked hard with both the UFS management and the DoH to try and achieve that; but more work needs to be done.”

I have worked with a number of fantastic staff members at the school, who are determined to do good in a challenging environment. I am amazed at the energy of the university leadership and how the Human and Academic Projects are executed. My wish for the university is to maintain and grow its standards and for the School of Medicine to maintain its reputation as one of the best schools in the country. I will always be a proud alumnus of the UFS,” he said.

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