Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
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

Centre for Africa Studies goes quadruple
2014-09-02

The Centre for Africa Studies at the UFS hosted a book launch on 27 August 2014. Prof Heidi Hudson expressed her excitement as she welcomed the audience and authors that evening, “This has not happened yet at our department where we launch four books at the same time, thus it is a happy and glorious moment for us.”

Book 1: Sacred Spaces and Contested Identities. Space and Ritual Dynamics in Europe and Africa. Edited by Paul Post, Philip Nel and Walter van Beek.

This book deals with the fundamental changes in society and culture that are forcing us to reconsider the position of sacred space, and to do this within the broader context of ritual and religious dynamics and what is called a ‘spatial turn’. Conversely, sacred sites are a privileged way of studying current cultural dynamics. This collection of studies on sacred space concerns itself with both perspectives by exploring place-bound dynamics of the sacred spaces in Africa and Europe.

Book 2: Understanding Namibia. The Trials of Independence. Written by Henning Melber.

This study explores the achievements and failures of Namibia’s transformation since independence. It contrasts the narrative of a post-colonial patriotic history with the socio-economic and political realities of the nation-building project.

Book 3: Peace Diplomacy, Global Justice and International Agency Rethinking Human Security and Ethics in the Spirit of Dag Hammarskjöld. Edited by Carsten Stahn and Henning Melber.

This tribute and critical review of Hammarskjöld's values and legacy examines his approach towards international civil service, agency and value-based leadership, investigates his vision of internationalism and explores his achievements and failures as Secretary-General. The book is also available in print. Melber is a Senior Adviser and Director Emeritus of The Dag Hammarskjöld Foundation, Uppsala, Sweden. He is also Extraordinary Professor at both the University of Pretoria and the Centre for Africa Studies, University of the Free State.

Book 4: Au commencement était le Mimisme: Essai de lecture globale des cours de Marcel Jousse ( In the beginning was mimism: A holistic reading of Marcel Jousse’s lectures). Written by: Edgard Sienaert

This publication allows us to hear the voice of Marcel Jousse, professor of Anthropology of Language, who taught in Paris between 1931 and 1957. Edgard Sienaert, after having edited and translated in English all publications of Jousse, returns here to Jousse’s one-thousand lectures, synthesised through the lens of an anthropology of human mimism. Jousse’s train of thought leads us to question our own thought categories stuck in antagonisms: spirit and matter, concrete and abstract, body and mind, science and faith. Sienaert is currently a research fellow at the Centre for Africa Studies, University of the Free State, with an MA and PhD in Romance Philology. He published widely on medieval French literature and on orality. 
 

We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept