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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

Qwaqwa Campus opens: Prof. PA Mbati's speech
2005-01-22

Official welcome speech by Prof. PA Mbati for 2005 first year students held on Saturday 22nd January 2005. Program Director, The Chief Director Operations Rev. Kiepi Jaftha, Dean of Students Dr. Natie Luyt, Program Head of the Faculty of Humanities, Dr. Elias Malete, Program Head of Faculty of Natural and Agricultural Sciences, Prof. Riaan Luyt, Acting Program Head of the Faculty of Economics and Management Sciences Prof. Andries Venter, Deputy Director Student Affairs Mr. Teboho Manchu, Coordinator Finance: Mrs. Elizabeth Nchapi, Senior Librarian Mr. Stoffel Kok, Senior Magistrate Mr Saul Mohosho, SRC President Mr. Tello Motloung, members of staff, invited guests, parents, guardians, my dear students, ladies and gentlemen.

It is indeed my pleasure to welcome you to the official welcoming ceremony of the UFS-Qwaqwa Campus 2005 first year students. Our Rector and Vice Chancellor Professor Frederick has requested me to pass to you his warmest wishes and regards on this special occasion. I am confident that the orientation exercise in which you have participated has achieved the desired effect of introducing you to your new way of life here on campus, and that you are now sufficiently prepared to get on with the rigors of being a student at this University.

Following the restructuring of the higher education landscape, the Qwaqwa campus was incorporated into the University of the Free State with effect from January 1 2003 . As a consequence, Management was faced with a whole complex series of challenges including, primarily making the campus financially viable, but also ensuring that it remains relevant in it’s core business as a satellite campus of the University of the Free State in terms of its teaching, learning, research and community service responsibilities.

A whole series of strategic planning workshops were conducted last year with both internal and external stakeholders. Various important strategic objectives were flagged out, and the next level of consultation will take place soon. I know that there is a lot of eagerness, sometimes to the level of impatience to see this process completed as quickly as possible. But again on the other hand, due to the far reaching consequences of any hasty decisions, plus the need for a carefully planned process, we need to be a little more patient before the implementation of the strategic objectives is implemented. You will be kept informed as this important and critical aspect in the evolution of our campus takes place.

As a response to the need for a more effective governance model on the Qwaqwa campus, a review of the governance structure was completed towards the end of 2004 and will soon serve before the Executive of the Executive Management for approval.

Due to the importance that top management attaches to the development of an effective governance on the Qwaqwa campus, the process was facilitated by an internationally acclaimed consultant. Again the contents of the revised governance model will be made known to the campus and the broader community once it is approved.

I am glad to report that in recognition of the need to improve the infrastructure on campus to provide a conducive learning atmosphere to our students, a total of 8.2 million rands was made available towards the end of 2004 for recapitalization of specifically our student residences and lecture venues. The first phase of the residence renovation is completed and residences C, D and E have now been officially handed over to the University by the Contractor. Among the features of the renovated residences is that they will now computer rooms, kitchenettes for cooking, and a redesigned TV room. The rooms have even been fitted with heaters. Our challenge will now be to maintain our newly acquired facilities and to ensure that they do not again deteriorate to an un-acceptable level. The second phase of renovation will start soon.

As indicated in my address during the orientation week, our obligation to you as a campus is to offer you quality training to the best of our ability, and to disseminate this knowledge to you within a conducive atmosphere worthy of good learning. On the other hand, our students have to take advantage of this opportunity to acquire the necessary skills and training in the various academic programs that we offer on campus.

We have a very simple agenda on this campus – our vision is to continuously strive to build and develop the Qwaqwa campus of University of the Free State into a truly quality institution of higher learning in our country. To develop a tradition and culture in which we are proud of who we are, and constantly and tirelessly working towards excellence in our academic programs, and other non-academic but core and important aspects in your growth and development such as sport and community service. To nurture young conscientious citizens who are aware of their duties and responsibilities. Ultimately to produce hard working young people who fully exploit their potentials, and who will serve this country with diligence when unleashed into the real world in effectively managing their roles and responsibilities in society, whether in private or government civil service.

I would like to encourage that the various stake holders of this campus, the students, academic, administrative and support staff, and our broader community, to work together in harmony for the well being of our campus. For this campus to continue to be relevant in the environment that we find ourselves, there is a need for continuous engagement of its various stake holders, and genuinely listening to each other. We must continuously and regularly keep our feelers on alert in order that we can remain relevant.

I am particularly inviting our parents and guardians, the alumni of this campus, and leaders from our community to join hands with us in seeking solutions to the various challenges that we continue to face on campus. I am open for frank and honest discourse on the best way forward for our campus.

The University of the Free State is committed in making tertiary education accessible to as many students as possible. In this regard, students who do not have the required ‘M’ score to gain entry into main stream classes are given an opportunity to study in the highly successful ‘bridging program’ in which learners are integrated with main stream students but with fewer courses to tackle in order to ensure success. This is done on the premise that such students have the potential to pursue a degree course, and that therefore within a well structured program, they can make a success of their lives.

The University is conscious of the fact that in many instances several academically deserving students fail to be admitted into university due to financial reasons. For students who are academically deserving but who because of reasons of poverty cannot pay the requisite fees, the university is able to assist such students through the National Financial Aid Scheme – commonly known as NSFAS, and University Merit Awards. Other incentives such as Sports bursaries are also available.

Please remember that it is important to balance your life on campus and the phrase ‘a healthy mind in a healthy body’ aptly describes this statement. Ensure that you participate in sport and cultural activities of this campus so that you can develop and strengthen the various God-given talents that you have been blessed with.

A second major ingredient for your success on campus is discipline and respect for rules, policies and procedures that govern the University of the Free State , and respect for your fellow students. Good discipline is a major contributory factor to success in life, and more so in your formative academic life at University. This means for example that you must attend all your lectures, complete your assignments on-time and visit the library frequently. Please manage your time wisely and responsibly. Remember that as a university student, you are basically the master and architect of your own destiny.

Think very carefully when you are confronted with difficult situations, be they negative peer pressure, or temptations to indulge in intoxicating drugs, and make the right choice.

The University has well trained personnel including a social worker, a psychologist and counselor, and members of the student affairs division under the leadership of Mr. Teboho Manchu, Deputy Director Student Affairs, who are available to assist whenever you require their help.

Today is also a special day because we have officially inaugurated the SRC President and the rest of the SRC leadership. I am sure that you all join me in congratulating the SRC for being elected to their leadership roles for 2005. Mr. SRC president and your team, please remember that you now have a huge responsibility in carrying out the aspirations of the student body on campus. I want to wish you luck and success as you champion the rights of your constituents, which I believe and trust will be compatible with management’s expectations with regard to quality teaching and learning on campus. As you are aware, Management values the input that the student leadership makes in the operational management of the affairs of this campus, and we look forward to a cordial, non-confrontational working relationship with a view of rendering un-paralleled service on campus.

Mr. Program Director, allow me to wish everyone here a successful and prosperous year. May the good Lord give us the strength and courage to overcome any obstacle that may be placed in our way in the course of our work in 2005.

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