From Bin to Brick: How Recycled Glass Could Reinvent Construction
A Greener Solution for Earth-Based Construction
Recent research led by the University of Portsmouth suggests that finely ground recycled glass could become a viable, eco-friendly substitute for cement in compressed earth blocks (CEBs). These blocks, already considered a low-carbon alternative to traditional bricks, are commonly made from soil and water and stabilised with cement to improve strength and durability. However, cement production remains one of the most carbon-intensive industrial activities globally.
The new study, published in Discover Civil Engineering, explores whether replacing cement with recycled waste glass powder could enhance sustainability while maintaining – or even improving – structural performance.
Experimental Approach Using Recycled Glass
The research team tested different blends of recycled waste glass particles (RWGP) and lime, mixed with soil and water. The glass content in the samples ranged from 0% to 25%. Key performance indicators included water absorption, compressive strength, and tensile strength – all vital for assessing construction material viability.
Dr Muhammad Ali, Associate Professor at the University of Portsmouth, explained the motivation: “There’s growing demand for alternative, more sustainable materials in the construction industry. Recycled glass offers great potential as both a structural stabiliser and a means of reducing industrial waste.”
Results: Stronger, Cleaner Building Blocks
The optimal formula was found to be a mix containing 10% recycled glass powder and 10% lime. This blend produced a compressive strength of 5.77 MPa after 28 days – a 90% improvement over unstabilised blocks, which measured just 3.03 MPa. Tensile strength also saw a 30% boost, rising to 0.52 MPa.
Microscopic analysis showed that blocks using the 10% RWGP blend exhibited no visible micro-cracks. By contrast, blocks with 25% recycled glass began to show surface damage, indicating that moderation is key to maintaining integrity.
Collaborative Research with Global Reach
The study brought together researchers from several institutions including:
- University of Portsmouth (UK)
- Akenten Appiah-Menka University (Ghana)
- London South Bank University (UK)
- Federal University of Technology (Nigeria)
- CSIR-Forestry Research Institute (Ghana)
Circular Economy in Practice
This research adds momentum to the growing movement within construction and waste management sectors to adopt circular economy principles. By diverting waste glass from landfill and repurposing it as a functional construction material, the industry can reduce carbon emissions, conserve resources, and lower costs.
What It Means for Waste Management
At Affordable Waste Management, we understand the vital role recycling plays in building a more sustainable future. We work with businesses across the UK to ensure recyclable waste – including glass – is collected responsibly and redirected to the most sustainable pathways. Our nationwide network of over 200 licensed waste contractors helps clients stay compliant while contributing to a cleaner, circular economy.
If your business generates commercial waste and you’re looking for a reliable, transparent partner for your waste collection and recycling needs – we’re here to help.