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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

Service learning teaching strategy essential for the infusion of graduate attributes
2017-01-02

Description: Dr Pulane Pitso Tags: Dr Pulane Pitso 

Dr Pulane Pitso, Director: Institutional Performance
Monitoring within Performance Monitoring and Evaluation
Branch in the Department of the Premier, Free State
Provincial Government (FSPG).
Photo: Rulanzen Martin

“Public service delivery is not only about ‘government’s sector end products’, but is also fundamentally related to the ways in which the citizens can be best served at the point of client interface, as the primary beneficiaries.”

It is against this backdrop that Dr Pulane Pitso’s study explored the role of Higher Education Institutions (HEIs) in infusing the curriculum with graduate attributes for improved service delivery. The study is entitled: Community service learning as a transformative tool for infusing the university curriculum with graduate attributes for improved service delivery.
 
Citizens the central focus in public-service delivery
Although with the advent of democracy, the South African public service introduced the Batho Pele “people first” initiative which is one of the key transformation-oriented initiatives to ensure that citizens are the central focus in public service  delivery. An extant literature indicates that more work by the government still needs to be done in terms of the institutionalisation and implementation thereof.

Notwithstanding that public service is primarily responsible for addressing challenges related to poor service delivery, Dr Pitso moved from a premise that a multifaceted and collaborative approach, underpinned by a concerted effort by all relevant sectors, is more likely to contribute significantly towards improving service delivery. Specific focus was given to sectors primarily mandated to lay foundations through training and development such as HEIs, since the nature and quality of public service largely depends on the nature, quality and relevance of the system of education.

CSL a transformative teaching strategy
The basis for her thesis, emanated from the contention that public service delivery is a dynamic process which cultivates into a citizen-government relationship.

“It is this relationship that makes the implementation of the Batho Pele initiative crucial in ensuring that the social fabric and moral character of government is not compromised, thus the sustainability and facilitation of the emerged relationship,” Dr Pitso says.

The study focuses on the notion of community service learning (CSL) as an increasingly recognised transformative teaching strategy. It transcends lecture halls and utilises communities as educational spaces to provide practical exposure to real-life experiences to students on both learning and serving the communities.

Instilling graduate attributes in students
Dr Pitso’s thesis, which was predominately qualitative in nature, comprised two main stages. The first stage of the study focused on determining the current state of the public service in terms of the implementation of the Batho Pele principles. Whereas with the second stage, the focus was on determining the extent to which the graduate attributes are instilled in students by means of an exit-level CSL module at the UFS.

Dr Pitso’s thesis, which was awarded to her on 30 June 2016, is the product of five years of hard work, commitment and perseverance. She said it would not have been realised if it had not been for the leadership and mentorship of her promoter, Prof Mabel Erasmus, and co-promoter, Prof Victor Teise.

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