Circular economy takes centre stage with new eco-friendly housing initiative in South Africa
Construction waste is finding new life in the form of eco-friendly building blocks used for low-cost RDP housing. This innovation is part of the Department of Science, Technology and Innovation's (DSTI) Circular Economy Demonstration Fund, which supports circular economy projects yet to reach large-scale impact in South Africa.
This milestone was marked on 11 April 2025 by the Council for Scientific and Industrial Research (CSIR), which partnered with Use-It Waste Beneficiation NPC and Key Bricks to demonstrate the prototype.
The DSTI deputy director-general for socio-economic innovation partnerships, Dr Mmboneni Muofhe and CSIR executive manager: hosted programmes, Bongani Memela, presided over the ribbon-cutting ceremony for the newly built demonstration house.
From waste to walls: The manufacturing process
Guests were hosted on site by the CSIR project manager, Aubrey Muswema; CSIR senior researcher in sustainability economics and waste, Belinda Putterill; and managing director of Use-it and Matt Olivier, chief executive officer for Key Bricks.
Those attending the site visit were guided through the process of manufacturing the innovative building blocks, starting from the crushing of waste glass and building rubble, to the finished block, and finally the low-cost housing structure.
The site visit provided attendees with behind-the-scenes insights into Key Bricks' operations, material mix ratios, design of structures and equipment used to produce the interlocking block.
Circular economy in action
Use-It and Key Bricks both shared their journey on taking steps to become green in their operations and working closely with the CSIR to test and refine the product ideas by adopting circular economy principles.
The green block contains 70% recycled waste content, including crushed waste glass, construction and demolition waste. The block itself is 100% recyclable.
What also sets the interlocking block apart is its design, allowing for the building to be easily constructed with limited building experience, and if needed, the structure can be later deconstructed and the blocks reused at another location.
The block is designed to interlock like Lego blocks, requiring no cement between layers. Each block features internal hollows, which, when stacked, create channels for the installation of electrical and water pipes, reducing the need to cut grooves (also known as 'chasing'), ensuring that the blocks remain intact. The blocks came from the need to find local markets for waste glass and building rubble in KwaZulu-Natal.
"It's not viable to transport waste glass from KwaZulu-Natal to Gauteng for recycling, the margins on this are just too slim, resulting in a lot of this waste remaining uncollected and impacting the environment," said Putterill.
Source: Supplied
Business and community impact
"We needed to find ways to use glass locally in KwaZulu-Natal.' Cities, towns and villages across the country are also plagued with the illegal dumping of building rubble in open spaces. These blocks use crushed waste glass and construction and demolition waste, thereby reducing the need for conventional virgin materials.
"Not only is building with this innovative block cost-effective, but it also saves construction time and requires minimal labour and building experience.
"The top structure was put up by relatively unskilled labour from the foundation stage to the roof within seven days – this is only possible because of the interlocking nature of the faceted blocks.
"By using waste as a resource, this interlocking block can unlock new business opportunities in the construction industry. Local businesses and value chains can benefit from the potential to generate additional revenue streams.
"It also has the potential to accelerate social relief efforts by addressing the country's housing backlog, while helping to keep our cities, towns and villages clean,' says Muswema.
The block-making machine has been demonstrated to the private sector, municipal officials, housing-sector representatives and other SMMEs in the building sector.
Deputy director-general at the DSTI, Dr Mmboneni Muofhe, said: "The work that has been done by all partners to date is commendable in demonstrating the principles of 'reduce, re-use, recycle', which in turn compels us to rethink the potential of everything that we use daily.
"South Africans have been practising circular economy principles for years, but they did not necessarily label these practices as such. The creativity and innovative mindset to repurpose single-use materials has always been there and simply needed to be unlocked systemically and collaboratively.
"The green brick is a testament to how collaboration among multiple actors, such as a science council, small enterprises and government, can deliver a product with social, economic, and environmental benefits. We remain open to the possibility of more partners collaborating with us to demonstrate and scale circular innovations."
Unlocking SA's circular economy potential
"The circular economy holds enormous potential for South Africa," says Professor Linda Godfrey., CSIR principal researcher and manager of Circular Innovation South Africa (CISA).
CISA is tasked by the DSTI to identify and support innovative circular economy demonstration projects through the recently launched Circular Economy Demonstration Fund. 'The circular economy studies published by the CSIR highlight that while the circular economy is not new to South Africa, we have not achieved the scale for meaningful impact.
The Circular Economy Demonstration Fund aims to partner universities and science councils with the private sector, to help business and industry demonstrate, de-risk and scale circular innovations, and in so doing, unlock much-needed socio-economic opportunities,' concluded Godfrey.
All rights reserved. © 2022. Bizcommunity.com Provided by SyndiGate Media Inc. (Syndigate.info).
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'The circular economy studies published by the CSIR highlight that while the circular economy is not new to South Africa, we have not achieved the scale for meaningful impact. The Circular Economy Demonstration Fund aims to partner universities and science councils with the private sector, to help business and industry demonstrate, de-risk and scale circular innovations, and in so doing, unlock much-needed socio-economic opportunities,' concluded Godfrey. All rights reserved. © 2022. Provided by SyndiGate Media Inc. (
