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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

During 2011: Achievements at the UFS
2011-12-01

Sarah Shannon


Dr Alex Amtaika, Department of Political Science

Description: 2011 Achievements_Alex Amtaika Tags: 2011 Achievements_Alex Amtaika

During a conference at Khon Kaen University in Thailand, Dr Alexius Amtaika from our Department of Political Science was elected as Executive Director and Convener of the International Committee of Scholars of Local Government. This honour was bestowed upon Dr Alexius during the first International Conference on Local Government at Khon Kaen University. 


Sarah Shannon

Description: 2011 Achievements_Sarah Shannon Tags: 2011 Achievements_Sarah Shannon

We all have heard stories about inspirational people, who defy the odds, fight circumstance every day and never give up. Sarah Shannon has cerebral palsy but has never stopped dreaming and achieving them.

Sarah is also a competitive swimmer, and is currently ranked seventh in the world in her class of disabilities.

She is currently completing her postgraduate certificate in Education, Foundation Phrase, through Unisa. She is also studying Sociology at our university.


DW Bester and Sannah Mokone, Rhodes Scholars

Description: 2011 Achievements_Rhodes Scholars Tags: 2011 Achievements_Rhodes Scholars

Of the four open Rhodes Scholarships available to students from all universities in Southern Africa, two of our students won these prestigious scholarships. DW Bester, B.Sc. Hons. Actuarial Science student, and Sannah Mokone, BPub-cum laude student, joined Oxford University in the United Kingdom in September 2011 to further their studies.

The Rhodes Scholarships, arguably one of the most prestigious scholarships in the world, were founded in 1903 in the will of Cecil John Rhodes and cover the full costs of study at Oxford University.

While academic excellence is a pre-condition for consideration for the Rhodes Scholarship, these scholarships are unique in that Rhodes Scholars are outstanding young students who excel academically, but very importantly, demonstrate leadership, are committed to making a difference in the world, and have the energy to fulfill their ambitions. 


Dr Derik Coetzee, Department of Sport and Exercise Sciences

Description: 2011 Achievements_Derik Coetzee Tags: 2011 Achievements_Derik Coetzee

When you suddenly receive a call during a World Cup year and requested to come and assist in leading the Springboks, then you have to know, you have something to offer. This is what happened to Dr Derik Coetzee from our Department of Exercise and Sports Sciences. This year he once again became involved in the Springbok rugby team, after he had been die Bokke’s conditioning trainer from 2004 to 2007.

His primary task as conditioning head was to help in seeing to it that the Springboks reached their best level of play – psychologically, physically an emotionally. Amongst others, his duties included the optimisation of the players’ muscle and explosive power, speed, anaerobic ability and technical skills.


Jefferson J Dirks-Korkee en Mart Kotzé

Description: 2011 Achievements_Jefferson and Mart Tags: 2011 Achievements_Jefferson and Mart

Jefferson J Dirks-Korkee, from Willowmore in the Eastern Cape, and Mart Kotzé from Bloemfontein, recently made history by being the first students from our Department of Drama and Theatre Arts featuring in an Afrikaans South African film Skoonheid, the first ever to be shown at the Cannes Film Festival.

The movie won the Queer Palm Award at the 2011 Cannes International Film Festival, where Robert de Niro was the chairperson of the panel of judges. 


Prof. Muriel Meiring, Department of Haematology and Cell Biology

Description: 2011 Achievements_Muriel Meiring Tags: 2011 Achievements_Muriel Meiring

Prof. Muriel Meiring, Specialist Scientist in our Department of Haematology and Cell Biology, is responsible for establishing the Specialised Haemostasis Laboratory at our university and the Universitas Hospital’s National Health Laboratory Service. She established this centre as a reference centre for Von Willebrand disease, a genetic bleeding disorder, in South Africa. This laboratory is internationally recognised for their research and as a reference laboratory.

Prof. Meiring develops and tests antithrombotic (anti-clotting) agents and her long list of publications, research awards and congress presentations has earned her a nomination for the Department of Science and Technology’s Distinguished Woman Scientist Award. She was one of two scientists of the National Health Laboratory Services (NHLS) to receive the award – Prof. Meiring being the only woman from our university.

Medical facilities from all over the country make use of her and her team’s expertise when testing for blood disorders and she hopes to expand the centre even further.  


Melinda Jonker

Description: 2011 Achievements_Melinda Jonker Tags: 2011 Achievements_Melinda Jonker

Melinda Jonker, one of our third-year financial economic students, won the overall national competition of the prestigious Traders Trophy competition at the Johannesburg Stock Exchange (JSE).

The competition, sponsored by Nedbank Capital and Oxyor in Amsterdam, requires participants to trade actual JSE-listed shares against one another on a simulated platform. The winner is determined not only by the highest profit, but also by the technique used throughout the trading session.

Christopher Diab, also a student from our Department of Economics, won the regional UFS competition. 


ASSAf members

Description: 2011 Achievements_ASSAF Tags: 2011 Achievements_ASSAF

Seven of our academic colleagues have been elected as members of the Academy for Science of South Africa (ASSAf). They are Proff. Hendrik Swart, Physics; André Roodt, Chemistry; Zakkie Pretorius, Plant Sciences; Max Finkelstein, Mathematics; James du Preez, Microbial, Biochemical and Food Biotechnology; Maryke Labuschagne, Plant Breeding; and Neil Roos from our Postgraduate School.

Due main objective of the Academy is to promote and apply scientific thought in the service of the society, in order to determine the quality and scope of the role that the Academy can plays in the country’s life and progress, and eventually apply it

Other colleagues who are currently members of ASSAf include Proff. Jonathan Jansen, Vice-Chancellor and Rector; Johan Henning, Dean: Faculty of Law; and Frans Swanepoel, Senior Director: Research Development.


Samantha Renda-Dollman

Description: 2011 Achievements_Samantha Dollman Tags: 2011 Achievements_Samantha Dollman

Samantha Renda-Dollman, a BSc (Zoology) student on our Qwaqwa Campus, has obtained 19 distinctions out of the 22 modules she has written since 2009.

Her hard work earned Samantha the prestigious Dux Student award of our 2011 Annual Student Affairs Excellence Awards, held at our Qwaqwa Campus. This makes her the best overall academic performer of the entire student body on this campus.  


Jaco Griessel

Description: 2011 Achievements_Jaco Griessel Tags: 2011 Achievements_Jaco Griessel

Jaco Griessel, an Honours student at our Odeion School for Music, received a prestigious Mandela Rhodes bursary for 2012 to study towards his Master’s degree next year.

Jaco, who is currently busy with his BMus Honours degree, is a performer par excellence, with many achievements to his name. In 2010, he received the Fanie Beetge Prize for the best undergraduate student in Systematic Music Studies. A year before, he received the same prize as best undergraduate student in Historic Music Studies. He shall continue his Master’s degree with Music Composition as field of specialisation at our university in 2012.


Prof. Helena van Zyl, UFS School of Management

Description: 2011 Achievements_Helena van Zyl Tags: 2011 Achievements_Helena van Zyl

Prof. Helena van Zyl, Director of the UFS Business School, was elected as President of the South African Association of Business Schools (SABSA). Since the beginning of 2010 she has been acting as president. Prof. Van Zyl is the first woman to occupy this position and also the first woman who is currently heading a business school in South Africa. She will serve SABSA as the president for the next two years.


Prof. Zakkie Pretorius, Department of Plant Sciences

Description: 2011 Achievements_Zakkie Pretorius Tags: 2011 Achievements_Zakkie Pretorius

Research by Prof. Zakkie Pretorius from our Department of Plant Sciences, has become part of Phase II of a mayor global project to combat deadly strains of a wheat pathogen that poses a threat to global food security.

Prof. Pretorius focuses on the identification of resistance in wheat to the stem rust disease and will assist breeders and geneticists in the accurate phenotyping of international breeding lines and mapping populations. In addition, Prof. Pretorius will support scientists from Africa with critical skills development through training programmes.

The Ug99 strain was discovered in Kenya in 1998, but are now also threatening major wheat-growing areas of Southern and Eastern Africa, the Central Asian Republics, the Caucasus, the Indian subcontinent, South America, Australia and North America. 


Prof. Danie Strauss, research fellow in the Faculty of Humanities

Description: 2011 Achievements_Danie Strauss Tags: 2011 Achievements_Danie Strauss

Prof. Danie Strauss, a research fellow in our Faculty of the Humanities, won the Dooyeweerd Prize from the Board of the Association for Reformational Philosophies in Amsterdam. Prof. Strauss, former Dean of our Faculty of the Humanities and head of our Department of Philosophy, won the prize for his book Philosophy: Discipline of the Disciplines. The prize is awarded for work in the field of systematic philosophy.


Nida Jooste and Ryan Lamb, Abe Bailey Travel Bursary holders

Description: 2011 Achievements_Abe Bailey Tags: 2011 Achievements_Abe Bailey

Nida Jooste and Ryan Lamb are two of the proud recipients of Abe Bailey Travel Bursaries. Both students are academic achievers, but also excel in other fields. This is what set them apart from the rest of the applicants for the bursaries.

Ryan (23), a Medical Physics Honours student at our Faculty of Health Sciences, received the Senate’s Medal for the best Bachelor’s Degree student at the UFS. He was one of 100 students at the Brightest Young Minds Summit this year and was one of the 2008 delegates to the World Youth Forum, hosted by the International Association for Poetry and Solidarity in Italy.

Nida (21) is a very familiar face on our Bloemfontein Campus, as she served as the Deputy Chairperson of our Interim Student Council in 2011. 


Loerie Award for Tarran Jacobs, Elizabeth Forson and Mafohlela Mahlatsi

Description: 2011 Achievements_Loerie Tags: 2011 Achievements_Loerie

The creativity of a group of students from our university was rewarded with a bronze Loerie Award after they won an internal competition. Tarran Jacobs, Elizabeth Forson and Mafohlela Mahlatsi, all third-year Marketing Communication students, won the award for an advertisement they designed for Cansa.

Each year, the third-year Marketing Communication students of our Department of Communication Science have the opportunity to flex their creative muscles in the Copy-writing class. The challenge is to design two advertisements for any charity organisation by applying the knowledge they gained from the subject in a practical way. The top three groups are then entered for the Loerie and Pendoring awards – two of the most prestigious awards in the South African advertising industry.

The top three groups designed advertisements for Cansa, the South African Blood Service and Crime Line.


Hendrik Kruger and Anke Malan walk away with awards at Pfizer UKZN Young Health Scientists Research Symposium

Description: 2011 Achievements_Pfizer Tags: 2011 Achievements_Pfizer

Two students in our Faculty of Health Sciences won awards at a Pfizer UKZN Young Health Scientists Research Symposium.

Hendrik Kruger, a medical student, represented his group, which won the clinical category with the paper “Injury patterns of occupants surviving motor vehicle accidents in the Free State”. This presentation was based on a study which is the first of its kind in South Africa.

The group with Anke Malan from our Department of Nutrition and Dietetics as presenter received the prize in the community-based category with the presentation ’Knowledge, practices and perceptions of undergraduate students at the UFS regarding the risk factors of osteoporoses’. Anke’s team was also nominated as the overall winner of the symposium. Presentations were delivered in three categories, namely clinical, community-based and laboratory research. 


Prof. Louis Scott, Department of Plant Sciences

Description: 2011 Achievements_Louis Scott Tags: 2011 Achievements_Louis Scott

Prof. Louis Scott from our Department of Plant Sciences was formally rewarded the Fellowship of Royal Society of South Africa (RSSA).

Prof. Scott is an internationally recognised Palinologist at our university and a B-rated scientist.

Fellows of the RSSA are considered to be part of a very elite group of South African scientists who have achieved international acknowledgment. 


Prof. Aldo Stroebel, International Academic Programmes in the Office of the Vice-Chancellor

Description: 2011 Achievements_Aldo Stroebel Tags: 2011 Achievements_Aldo Stroebel

Prof. Aldo Stroebel has been elected as a Founding Member of the South African Young Academy of Science (SAYAS).

He is Associate Professor in our Centre for Sustainable Agriculture, Rural Development and Extension, as well as the Director of International Academic Programmes in the Office of the Vice-Chancellor.

The Young Academy has as its objectives to represent young scientists in advising the government on science and technology policy and human resource development. In addition, they will prepare the SAYAS to join the Global Young Academy (GYA) to engage with high-level international bodies, including the World Economic Forum.  


Prof. Lodewyk Kock, Department of Microbial, Biochemical and Food Biotechnology

Description: 2011 Achievements_Lodewyk Kock Tags: 2011 Achievements_Lodewyk Kock

Prof. Lodewyk Kock was a sought-after keynote speaker at various conferences and seminars around the globe on our nanotechnology breakthrough research.

He delivered keynote lectures at international conferences of repute in the USA, China and Greece. In the USA he delivered a the keynote address at the Conference & Exhibition on Pharmaceutical Regulatory Affairs (Pharma-2011), held in Baltimore, and was a keynote speaker at the 2nd World Congress on Biotechnology in Philadelphia. He was also invited to present various lectures abroad.

He posted two video lectures in e-conference format on his research on the web page of the journal Translational Biomedicine. He was also invited by the International Society of Translational Medicine (ISTM) to head their “Molecular Imaging” Division.
 

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