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12 June 2025 | Story University of the Free State | Photo Supplied
Dr Hossein Naghizadeh and Refilwe Lediga
Collaborative innovation in action: Researchers from the University of the Free State’s Green Concrete Lab have partnered with the University of Johannesburg to advance 3D printing technologies using sustainable concrete materials. Pictured (from left): Dr Hossein Naghizadeh, Senior Lecturer in Engineering Sciences at UFS, and Refilwe Lediga, Concrete Printing Research Expert in the Department of Civil Engineering Technology at UJ.

In an ambitious and interdisciplinary effort to address today’s Grand Challenges, researchers at the University of the Free State (UFS) are exploring how nature’s oldest life forms – stromatolites – can inspire cutting-edge innovations in industrial ecology and marine conservation.  Drawing from biomimicry, 3D printing, and microbial engineering, their work showcases the convergence of ecological insight with modern technology. 

“One such example is replicating the structures of stromatolites – some of the earliest evidence of life - using green cement and 3D printing, the latest technology in industrial ecology,” explains Dr Jacques Maritz, Head of the Unit of Engineering Sciences at UFS. 

 

Ancient structures, modern science  

Stromatolites are layered microbial formations created by ancient cyanobacteria and date back over 3.5 billion years. These living fossils, found in fossil records and rare modern environments like Shark Bay in Australia, grow through a combination of photosynthesis, sediment trapping, and calcium carbonate precipitation. Not only do they support biodiversity, but they also play a vital role in natural carbon sequestration. 

UFS researchers are harnessing the lessons from these ancient formations to address urgent environmental challenges. In particular, Dr Yolandi Schoeman, Senior Lecturer at the Centre for Biogeochemistry, is leading efforts to cultivate hybrid stromatolites in controlled environments, using microbial consortia grown on 3D-printed scaffolds.  

“At UFS, we are reimagining stromatolite formation through both artificial structural replication and biological cultivation, bridging industrial ecology and microbial engineering to address modern environmental challenges,” says Dr Schoeman. 

 

Ecological engineering for reef restoration 

The rapid decline of marine biodiversity and the degradation of natural reef ecosystems have prompted ecological engineers to develop innovative solutions. At the UFS Green Concrete Lab, researchers are pioneering the design of artificial reefs using 3D-printed, low-carbon geopolymer concrete – a material formulated from industrial by-products such as fly ash and slag. 

Artificial reefs mimic natural reef complexity and serve as critical habitats for marine life, from fish and crustaceans to coral polyps and algae. Algae, in particular, are key to marine ecosystems due to their roles in nutrient cycling, oxygen production, and carbon capture. 

“Green concrete refers to concrete that utilises alternative binders and industrial by-products, significantly reducing the environmental footprint. At UFS, we are focusing on geopolymer concrete, which eliminates the high-energy processes associated with Portland cement, while offering greater chemical resistance - ideal for marine applications,” explains Dr Abdolhossein Naghizadeh from the Unit of Engineering Sciences. 

 

3D printing nature’s complexity 

One of the challenges in artificial reef development is replicating biologically inspired geometries that support diverse marine ecosystems. Traditional construction methods often fail in this regard, but additive manufacturing, or 3D concrete printing, is providing a solution.  

The UFS Green Concrete Lab, in collaboration with the University of Johannesburg, is developing reef modules with intricate geometries and natural surface textures. These features support coral and algae attachment, accelerate ecological colonisation, and enhance habitat functionality. Biochar-based compost filters are also being integrated to aid algae-driven wastewater treatment. 

A particularly novel avenue of research involves using 3D printing to recreate stromatolite structures. These serve as ancient blueprints for modern reef design, merging deep-time ecological understanding with advanced material science. 

 

Biologically engineered hybrid stromatolites  

In parallel to structural efforts, UFS is advancing biological approaches to stromatolite cultivation. From July 2025, researchers in the Unit of Engineering Sciences will initiate a large-scale experiment using microbial consortia in 60-litre tanks, scaling up to 1 m² hypersaline ponds. 3D-printed conical scaffolds, coated with materials such as PP-CaCO₃, hydroxyapatite, and silica gel, will accelerate microbial colonisation and lamination. 

The goal: to achieve stromatolite growth of 14-16 mm in just 28 days - over 150 times faster than in nature. These hybrid systems are expected to produce 7-8 mg/L/day of oxygen, sequester carbon at 3.2 g/m²/day, and remove up to 90% of nitrates and phosphates from water. The potential applications extend from terrestrial ecosystem restoration to extraterrestrial life-support systems. 

 

A multidisciplinary vision for sustainability 

This work exemplifies the strength of interdisciplinary research at UFS, combining civil engineering, mechatronics, marine ecology, chemistry, microbiology, and digital fabrication. The Ecological Engineering Sciences stream fosters a vibrant environment for postgraduate students to develop practical, impactful solutions.  

The Green Concrete Lab is central to these efforts, offering students and researchers access to advanced technologies and collaborative networks. Through their innovative work in 3D-printed green concrete and microbial systems, UFS researchers are addressing biodiversity loss, advancing sustainable construction, and contributing to the global climate agenda. 

“Whether it's rethinking materials, restoring ecosystems, or redefining what concrete can be, our research is laying the foundation for a better, more sustainable world beneath the waves,” concludes Dr Maritz. 

News Archive

SA universities are becoming the battlegrounds for political gain
2010-11-02

Prof. Kalie Strydom.

No worthwhile contribution can be made to higher education excellence if you do not understand and acknowledge the devastating, but unfortunately unavoidable role of party politics in the system and universities of higher education and training (HET).

This statement was made by Prof. Kalie Strydom during his valedictory lecture made on the Main Campus of the University of the Free State (UFS) in Bloemfontein recently.

Prof. Strydom, who was awarded an Honorary Doctorate by the UFS in 2010, presented a lecture on the theme: The Long Walk to Higher Education and Training Excellence: The Struggle of Comrades and Racists. He provided perspectives on politics in higher education and training (HET) and shared different examples explaining the meaning of excellence in HET in relation to politics.

“At the HET systems level I was fortunate to participate in the deliberations in the early nineties to prepare policy perspectives that could be used by the ANC in HET policy making after the 1994 elections.  At these deliberations one of the important issues discussed was the typical educational and training pyramid recognised in many countries, to establish and maintain successful education and training. The educational pyramid in successful countries was compared to the SA “inverted” pyramid that had already originated during apartheid for all races, but unfortunately exploded during the 16 years of democracy to a dangerous situation of 3 million out-of school and post-school youth with very few education and training opportunities,” he said.

In his lecture, Prof. Strydom answered questions like: Why could we as higher educationists not persuade the new democratically elected government to create a successful education and training pyramid with a strong intermediate college sector in the nineties?  What was the politics like in the early and late nineties about disallowing the acceptance of the successful pyramid of education and training?  Why do we only now in the latest DHET strategic planning 2010–2015 have this successful pyramid as a basis for policymaking and planning?

At an institutional level he explained the role of politics by referring to the Reitz incident at the UFS and the infamous Soudien report on racism in higher education in South Africa highlighting explosive racial situations in our universities and the country.  “To understand this situation we need to acknowledge that we are battling with complex biases influencing the racial situation,” he said.

“White and black, staff and students at our universities are constantly battling with the legacy of the past which is being used, abused and conveniently forgotten, as well as critical events that white and black experience every day of their lives, feeding polarisation of extreme views while eroding common ground.  Examples vary from the indoctrination and prejudice that is continued within most homes, churches and schools; mass media full of murder, rape, corruption; political parties skewing difficult issues for indiscrete political gain; to frustrating non-delivery in almost all spheres of life which frustrates and irritates everyone, all feeding racial stereo typing and prejudice,” said Prof. Strydom.

A South African philosopher, Prof. Willie Esterhuyse, recently used the metaphor of an “Elephant in our lounge” to describe the syndrome of racism that is part of the lives of white and black South Africans in very different ways. He indicated that all of us are aware of the elephant, but we choose not to talk about it, an attitude described by Ruth Frankenberg as ‘colour evasiveness’, which denies the nature and scope of the problem.

Constructs related to race are so contentious that most stakeholders and role-players are unwilling to confront the meanings that they assign to very prominent dimensions of their experience; neither does management at the institutions have enough staff (higher educationists?) with the competencies to interrogate these meanings, or generate shared meanings amongst staff and students (common ground).  A good example that could be compared with “the elephant in our lounge” remark is the recent paper of Prof. Jonathan Jansen, Rector and Vice-Chancellor of the UFS on race categorisation in education and training.

According to Prof. Strydom, universities in South Africa are increasingly becoming the battlegrounds for political gain which creates a polarised atmosphere on campuses and crowds out the moderate middle ground, thereby subverting the role and function of the university as an institution within a specific context, interpreted globally and locally. 

Striving for excellence, mostly free from the negative influences of politics, in HET, from the point of view of the higher educationist, is that we should, through comparative literature review and research, re-conceptualise the university as an institution in a specific context.  This entails carefully considering environment and the positioning of the university leading to a specific institutional culture and recognising the fact that institutional cultures are complicated by many subcultures in academe (faculties) and student life (residences/new generations of commuter students).

Another way forward in striving for excellence, mostly free from politics, is to ensure that we understand the complexities of governing a university better.  D.W. Leslie (2003) mentions formidable tasks related to governance influenced by politics:

  • Balancing legitimacy and effectiveness.
  • Leading along two dimensions: getting work done and engaging people.
  • Differentiating between formal university structures and the functions of universities as they adapt and evolve.
  • Bridging the divergence between cultural and operational imperatives of the bureaucratic and professional sides of the university.

Prof. Strydom concluded by stating that it is possible to continue with an almost never ending list of important themes in HE studies adding perspectives on why it is so easy to misuse universities for politics instead of recognising our responsibility to carefully consider contributions to transformation in such an immensely complicated institution as the university within a higher education and training system. 

Media Release
Issued by: Lacea Loader
Director: Strategic Communication (acting)
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl@ufs.ac.za
29 October 2010

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