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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

The solution to student food insecurity is a holistic approach
2017-02-10

Description: Dietetics read more Tags: Dietetics read more

Dr Louise van den Berg from the Department of
Nutrition and Dietetics says the University of the Free State
is taking steps to teach students how to budget and make
them aware how important food nutrition is.
Photo: Pixabay 

Research at the University of the Free State (UFS) has indicated that nearly 60% of students are victims of food insecurity and suffer from hunger most of the time. The research by the UFS Faculty of Health Sciences shows that a further 25% are food insecure but are not hungry most of the time.

Senior Lecturer in the Department of Nutrition and Dietetics, Dr Louise van den Berg, says food insecurity is common among student populations across the world. However, local research shows that it is almost double that of tertiary institutions in developed countries.

Food insecurity among students caught many people off-guard
Dr Van den Berg says in South Africa nobody had really looked at the problem until recently “It seems student food insecurity has caught many people off-guard.” She says people tend to think of tertiary students as a privileged group.

The research has now indicated how deep the problem really is on campus. The students that most likely go hungry are single, male, black or coloured, and are generally first-generation students.

They are also mostly undergraduates, those paying their studies from non-bank loans or bursary means, those not living with their parents or guardians or those that need to support somebody else financially.

The results further indicate that those that are likely to suffer from hunger seldom or never have enough money for food but have to borrow money for food, have to ask for food, sell items to get food or steal food.

“A healthy student is a
successful student.”

Bursary money send back home for parents to survive
Dr Van den Berg agrees that one of the main reasons for the situation is economic stress. Research has shown students rarely spend money on food when resources are scarce. Furthermore, parents of students studying with bursaries are not always able to fully support them on campus. Some students send bursary money back home for their parents to survive.

She says other factors that contribute to campus food insecurity are that all over the world universities have terminated catered food halls due to high costs. “To a large extent this has created a food desert for students and now they need to look after themselves.”

To throw money at the problem does not seem to be the answer. 

Students are food-uncertain beings
The research indicates that young people on campus do not know where to buy food, much less the correct, nutritional food they need. Dr Van den Berg says most universities are now aware of the problem and have been taking steps. This includes teaching students how to budget and making them aware how important nutrition is for their success and their responsibility for themselves.

Universities are also looking at private funding for food aid and food schemes. Dr Van den Berg says other solutions are the restructuring of bursary fees, student self-help initiatives and food gardens.

The Faculty of Health Sciences is taking the initiative to manage a food blog on the UFS website. It will also use other social media platforms to post food-preparation videos and recipes for students.

Dr Van den Berg says it is important to grow the 15.6% group of students who indicated they are food secure because a healthy student is a successful student.

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