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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

UFS ICT Services mentioned among global PeopleSoft pioneers
2017-10-23

 Description: Andrew read more Tags: ICT services, technology, innovations, PeopleSoft, Oracle, students, IT, awards 

Andrew Jusjong, Chief Officer: ICT, one of the main drivers
of PeopleSoft at the UFS. 
Photo: Rulanzen Martin

At the beginning of his term, the Rector and Vice-Chancellor of the University of the Free State (UFS), Prof Francis Petersen, mentioned to parents and prospective students the importance of the UFS being recognised globally as innovators. 

This month, Information and Communication Technology Services (ICT Services) were recognised by Oracle as one of the PeopleSoft Innovators at the Oracle OpenWorld (an international conference regarding all Oracle products) for deploying student self-service, using PeopleSoft Campus Solutions’ new Fluid user interface.  

Andrew Jusjong, Chief Officer: ICT, says, “This solution allows dynamic administrative setup regarding available degrees, customised messages, dynamic required degree-specific documentation, and integration with the Applications and Admissions module.”  He says it also includes self-service functionality that allows students to track the status of their applications, and provide additional documentation required for their study choices.

“The UFS is the only innovator in the European, Middle-Eastern and African region. Considering that the development team at the UFS is much smaller than their international counterparts, this illustrates that we do not have to stand back for our international peers regarding service delivery and the quality of service to our customers,” he says.

The PeopleSoft Innovator awards are presented to companies that are taking advantage of the latest capabilities and technologies provided by Oracle PeopleSoft in order to transform their businesses and their IT practices, while also providing benefits to the business and end users. The UFS has been making use of PeopleSoft applications since 2004. It currently makes use of three applications:

- PeopleSoft Financials for procurement, budgeting, billing, asset management, general ledger, journals, provisioning, payroll, commitment control, ad hoc claims, travel and expenses, and maintenance management.
- PeopleSoft Human Capital Management for HR data processes, recruitment, workforce management, remuneration management, leave management, employee self-service, and other HR activities; and 
- PeopleSoft Campus Solutions for student lifecycle management, applications and admissions, curriculum management, programme enrolment, student records, student financials (accounts), financial aid, graduation, alumni management, graduate research management, residences, and student self-service.

In the Higher Education sector, PeopleSoft is being used by over 900 campuses in 34 countries, across six continents. “This means that recognition was given to the university on a global platform,” says Jusjong.

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