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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

Prof Jonathan Jansen bids farewell to Kovsies
2016-08-31

 

Dear Kovsie staff and students

This is my final message to you all.

I wish to use this opportunity for some brief reflections, share a word of gratitude, and convey a sense of the future for our beloved university.

Since the announcement of my departure, I have had more than a dozen breakfasts with mainly students, but also staff, to offer an opportunity for the final sharing of thoughts and, of course, goodbyes. The most common questions asked at those breakfast sessions were the following, with my responses. I repeat them here, since these might also be of interest or concern to you.

What are your proudest achievements?
Two things. The increase in the academic standard for the UFS, both in terms of admission standards and pass rates, but also in relation to the requirements for appointment and promotion especially of professors. This is important because in a globally competitive world, a university stands or falls by the quality of its degrees. And for this you need the best students and the best professors.

What would you do differently, given another chance?
Nothing. I believe that leadership is about doing the best you can with the cards you are dealt in the circumstances in which you are placed. There is no point in second-guessing past decisions. I have always been ambitious as a leader, knowing that most of my goals would be met, and that some would not. That is normal in large and complex organisations, and so, I do not sit around pondering regrets, only remembering with gratitude the things we could achieve together.

What did you learn?
A lot. I learnt that our students have tremendous capacity for greatness both in their academic pursuits but also in their ability to live, and learn, and love together. I have learnt never to underestimate the capacity of our youth to excel in whatever they do. Sometimes I felt I was more ambitious for our students and staff, than they were for themselves. But I have constantly been surprised by the capacity of young students to rise above bitterness and division, and to make great our campus, country, and continent.

I learnt, again, that the overwhelming majority of our staff and students are good people, respectful of each other, and determined to work together to heal our broken past and build a more just society. And I learnt that it is much more fulfilling to build up than to break down, to embrace than to exclude, and to love than to hate.

Were you frustrated with the pace of transformation?
Sometimes, yes. But fortunately I studied educational organisations all my life, mainly schools and universities. Universities are called institutions for a reason, and on century-old sites like the historic Bloemfontein Campus of the University of the Free State, there are core beliefs, values, and practices deeply ingrained in the culture of the place.

Anyone, therefore, who believes that transformation is easy, has obviously never tried to change an old university. It is difficult. You will get blowback. You will get bad press. You will, sadly, lose the support of some people. Some believe the university is changing too fast while others will tell you it is not changing fast enough. As you press for change, you find the university going two steps forward and one step back; in these circumstances, the solemn duty of the leader is simply to ensure that the overall momentum is always forward.

For such a time as this –
a commemorative journey:
2009-2016 (PDF book)

Description: Prof Jansen commemorative journey2 Tags: Prof Jansen commemorative journey

I therefore budget for disappointment even as I relish the many changes we have experienced together over the past seven years. If you want to obtain an objective sense of the scale of the changes at the UFS, ask those students and staff who were here in 2009, not those who came recently. They will tell you that we have a very different university, even though we all acknowledge that there is still some distance to travel. Our remarkable story of change is told in the recent Transformation Audit of the UFS, chaired by Prof Barney Pityana; that Audit Report will be released after it is read and studied by the University Council at its November meeting.

At an individual level, I learnt that most campus citizens change quickly and others more slowly, and that one has a duty to constantly push for change, but also to be patient about change. And I learnt that the ideal change retains the best of our past even as we embrace a more just and inclusive future in which all campus citizens feel that the university truly belongs to each and every one of them.

Are you optimistic about the future of our university?

Yes. The UFS is a very well-managed university thanks to the exceptional talent in the management of our finances, human resources and information technology environments. By the end of 2016, we will have record enrolments, from undergraduates to doctoral students, which is good for our future income. We run a tight ship with regard to the university’s finances, and we have greatly improved the academic standard of our qualifications; in this regard, I am very proud of my senior management team, and the talented middle management personnel, and those who make things work at the coalface of our operations.

I am very concerned, however, about future funding of the 26 public universities and the extremely vulnerable situation of at least 10 higher-education institutions. The economy is not growing and the costs of running a modern university are escalating. The delays in government commission reports on tuition fees do not help, and there seems no urgency ‘higher up’ to make the tough decisions.

We have to ensure free education for the poorest students — that is the position of your senior management – but we also need to guarantee the financial sustainability of our universities. The task of the UFS leadership, in this period of uncertainty, is to manage those two expectations as best we can. But this cannot happen without your assistance, and I do ask that you provide the new Rector and his or her team with the same understanding and support which I have enjoyed from you.

In conclusion
I am grateful.

To the many hundreds of students who have passed through my office and our home, and who sat in my many lectures and engaged me in your residences – thank you for enriching my sense of life and leadership. I am grateful that Grace and I could support and mentor many of you over the years and see you graduate. I am a better leader because of you.

To the staff of the three campuses – there is no university Rector, I can assure you, who enjoyed more love and support than what you offered me since the day I arrived here. Students come and go, but you have been my foundation year after year, and I thank you for that.

To parents, friends, and followers off-campus, in South Africa and abroad – thank you for hundreds of letters, emails, phone calls, prayers and ‘packages of support’ (from biltong to books). In the most difficult times, you rallied from everywhere with a word of support, often on social media. Know this: your words kept me calm in the storm.

Thank you, everyone.

Goodbye.

Prof Jonathan Jansen
Vice-Chancellor and Rector
University of the Free State

Description: Prof Jansen saying goodbey Tags: Prof Jansen saying goodbey

Prof Jonathan Jansen steps down as UFS Vice-Chancellor and Rector (16 May 2016)

 

 


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