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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

Bullying in schools: Everyone’s problem
2005-06-03

From left:  Prof Gerhardt de Klerk, Dean: Faculty of the Humanities; Prof Corene de Wet; Prof Rita Niemann, Head of the Department of Comparative Education and Educational Management in the School of Education and Prof Frederick Fourie, Rector and Vice-Chancellor of the UFS

It is not only learners who are the victums of bullying in schools, but also the teachers. Prof. Corene de Wet from the Department Comparative Education and Educational Management at the University of the Free State reported, against the background of two studies on bullying in Free State secondary schools, that bullying is a general phenomena in these schools.

Prof. de Wet, who delivered her inaugural lecture on Wednesday night, is from the Department Comparative Education and Educational Management which resorts under the School of Education at the University of the Free State. She is the first women who became a full professor the School of Education.

Prof. de Wet says, “A student is being bullied or victimized when he or she is exposed, repeatedly and over time, to negative action on the part of one or more students. Bullying always includes the intentional use of aggression, an unbalanced relationship of power between the bully and the victim, and the causing of physical pain and/or emotional misery.

In some Free State schools there are victims and perpetrators of direct and indirect verbal, as well as emotional, physical and sexual bullying.

“Adults who say that bullying are part of the growing-up process and parents who set not only academic expectations but also social expectations to their children cause that victims are unwilling to acknowledge that they are being bulled. Many parents are also unaware of the levels of bullying their children are exposed to.

“Some of the learners were at least once a month the victim of direct verbal harassment, 32,45% were assaulted by co-learners and 11,21% of them were at east once per week beat, kicked, pushed and hurt in any other physical way. Free State learners are very vulnerable to bullies at taxis and on the school yard they are mostly exposed to bullies in bathrooms.

“Learners are usually bullied by members of the same gender. However, racial composition also plays a role in some Free State schools. A grade 12 girl writes, ‘There are boys in my school who act means against black people. When the teacher is out they take a red pen and write on the projector and spray it with spirits. It looks like blood and they would say it is AIDS and my friends and I have it.’

“Educators must take note of bullying in schools and must not shrug it off as unimportant. Principals or educators could be find guilty of negligence. A large number of educator respondents, 88,29%, indicated that they would intervene in cases of verbal bullying and 89,71% would intervene if they saw learners being physically bullied. However, only 19,97% of the learners who were victims of bullying were helped by educators/ other adults from their respective schools.

“The learners’ lack of trust in their educators’ abilities and willingness to assist them in the fight against bullying has important implications for education institutions. The importance of training must be emphasised.

Learners bully their educators to undermine their confidence. In Prof. de Wet’s study on educator-targeted bullying in Free State schools 24,85% of the respondents were physically abused by their learners, 33,44% were the victims of indirect verbal bullying, and 18,1% were at one time or another sexually harassed by their learners. These learner offences may lead to suspension.

“Educators are not only victims of bullying; some of them are the bullies. The South African Council for Educators prohibits bullying by educators. It is worrying that 55,83% of the educators who participated in the research project verbally victimised learners, 50,31% physically assaulted learners and a small percentage was guilty of sexual harassment.

“Every educator and learner in South Africa has the right to life, equal protection and benefit of the law, of dignity, as well as of freedom and security of the person. These rights will only be realised in a bully-free school milieu.

“To oppose bullying a comprehensive anti-bullying programme, collective responsibility and the establishment of a caring culture at schools and in the community is necessary,” said Prof. de Wet.
 

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