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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

Guest lecture: Mr Pretorius, CEO of McCarthy Limited
2004-11-05

The challenges facing business leaders in a rapidly changing South Africa

“The world we used to know does not exist anymore. Leaders are continually dealing with crisis and opportunities, in a high-pressure environment,” said Mr Brand Pretorius, honorary professor from the University of the Free State , delivering his 13th guest lecture on the challenges facing business leaders in a rapidly changing South Africa .

Mr Pretorius, CEO of McCarthy Limited, identified certain trends which are responsible for changes to the South African business environment. He said the South African business environment is ever-changing, fast moving, complex and unpredictable. “As business people we have to deal with the impact,” he said.

“Years ago we were globally isolated. Now we live in a shrinking borderless world with crumbling trade barriers. Globilisation of our economy is accelerating. For South African business leaders this creates a sea of export opportunities,” he said.

Although there are ongoing demands for substantial profit growth from shareholders, the days of focussing only on their interests are gone, said Mr Pretorius. Stakeholder commitment now enjoys high priority and business leaders have to deal with the challenges accompanying black economic empowerment and employment equity.

Customers are also well-informed and demanding. Business leaders could easily loose the loyalty of their customers because of a hyper-competitive environment with an oversupply of goods and services.

Mr Pretorius stated that staff want to be involved and are looking for meaning in their workplace. Employers also have to deal with HIV/Aids in their workplaces. Trauma, absenteeism and financial implications could have a great effect on the viability of a business.

Against these changes Mr Pretorius pointed out the challenges business leaders are facing. In doing so a number of questions arise. The external business climate is characterised by turbulence and change. Internally there is a need for stability and meaning. How do we handle both challenges effectively?

Because of changes strategy decay is taking place and past strategies become irrelevant. Mr Pretorius said that business leaders need to modify their business models to prevent the downfall of their companies.

It is important for leaders to know what is happening in their world. “Continuous innovation is a critical success factor. The reality is that innovation is the only insurance against irrelevance,” he said.

Because of a changed environment leaders must perform and transform, simultaneously. How do we strike a balance between focused transformation and the achievement of world class performance, asked Mr Pretorius? “We need to bring about meaningful and sustainable empowerment, in order to create an inclusive economy and society. Leadership and management profiles should reflect the diversity of our teams, however at the same time every effort should be made to stop the brain drain and retain the expertise of experienced white managers.”

He also stated that leaders have an important role to play in terms of employment creation and corporate caring. “Sustainable stability and prosperity will not materialise without efforts in this regard.”

Mr Pretorius said that above challenges could be addressed by developing the ability to focus on creating a better future, rather than defending the past, a long-term vision, facing new realities, enhancing the value of brands and mobilising IT and the Internet to serve the business and customers better.

Retaining a positive vision of the future, embracing change and transformation, building your business according to the right principles and values and aspiring to be the best are some of the guidelines, according to Mr Brand, for future business success. He stated that creating a value advantage above one’s competitors, customer satisfaction and retention and inspirational leadership will add to the success of one’s business.

“We are indeed living in the era of the ultimate challenges, but also the ultimate opportunities. Let me clearly state that I have hope – in my view the tide has turned. Every day I experience small miracles inspired by ordinary people making an extraordinary difference,” said Mr Pretorius.

 

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
5 November 2004

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