Concrete has become the backbone of modern life, yet its climate cost keeps climbing every year. As the world races to electrify cars and store renewable energy, Australian researchers say a forgotten by-product of lithium mining could help rewrite the rules of how we build.
Concrete’s hidden climate bill
Humans now pour roughly 30 billion tonnes of concrete each year. That works out to about 952 tonnes every single second.
Traditional concrete relies on Portland cement, made by heating limestone and other minerals in giant kilns. That process guzzles fuel and releases carbon dioxide from the rock itself.
Concrete accounts for an estimated 8% of global CO₂ emissions, according to recent IPCC assessments.
On top of this carbon hit, the industry devours sand, gravel and limestone at an enormous scale. Analysts estimate concrete is linked to around 30% of all non-renewable resources extracted for construction worldwide.
Governments want new housing, infrastructure and data centres. Climate targets demand deep cuts in emissions. Those two realities collide in the same grey material.
From lithium waste to “green” concrete
A problem pile at the lithium refinery
The energy transition has set off a global rush for lithium, a key ingredient in batteries for electric cars, grid storage and electronics. Mines and refineries now produce vast quantities of lithium-bearing ore, process it, then discard what’s left.
One of those discards is delithiated β‑spodumene, often written as DβS. After lithium is extracted from spodumene ore, the remaining mineral mix turns into a fine waste material. In most cases, it gets stored in tailings dams or landfills.
That waste comes with long-term costs: land occupation, monitoring, and potential risks for surrounding soil and water if storage fails.
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The Flinders University experiment
A team led by Professor Aliakbar Gholampour at Flinders University in Australia decided to rethink that pile of residue. Instead of treating DβS as a liability, they asked whether it could help clean up concrete.
They turned to geopolymer concrete, a class of binders that replace Portland cement with aluminosilicate-rich materials activated by alkaline solutions. Geopolymers can slash emissions because they avoid the high-temperature clinker stage that defines standard cement.
By folding delithiated β‑spodumene into geopolymer mixtures, the lab created a concrete that uses mining waste instead of fresh raw materials.
In their tests, DβS acted as an additive and partial replacement for common geopolymer ingredients such as fly ash. Fly ash, a residue from coal-fired power plants, has long been used in low-carbon concretes, but it comes from another polluting industry now in decline.
How the “lithium waste concrete” performs
Mix design and mechanical strength
The researchers experimented with different proportions of DβS, binder materials and alkaline activators. They adjusted the chemistry to trigger the geopolymerisation reaction at room temperature, avoiding energy-intensive curing.
One of the optimised mixes showed notable results: it matched or exceeded the compressive strength of many conventional concretes while holding its own against established geopolymer blends.
Early findings suggest several performance gains:
- Improved mechanical strength compared with some standard mixes
- Higher resistance to long-term degradation
- Reduced reliance on fly ash or slag from heavy industry
- Potentially lower overall emissions per cubic metre of concrete
The study, published in the Journal of Materials in Civil Engineering, also examined the microstructure of the cured material. Microscopic analysis indicated a dense, well-bonded matrix, which typically points to good durability.
In plain terms: the waste-based concrete did not just “work” — it looked strong enough for real-world structures.
Environmental payoff and circular logic
The promise lies in two overlapping benefits. First, every tonne of DβS reused in concrete is one less tonne stored as waste. Second, substituting that waste for fresh raw material or high-carbon cement cuts the footprint of the final product.
The approach fits neatly into an emerging model of circular economy in heavy industry:
| Stage | Traditional path | Circular alternative with DβS |
|---|---|---|
| Lithium extraction | Ore processed, waste stockpiled | Ore processed, waste redirected to construction |
| Concrete production | New raw minerals, high-clinker cement | Mining residues and geopolymer binders |
| Environmental impact | High emissions, large waste dumps | Lower emissions, reduced landfill burden |
As lithium production scales up to serve EVs and batteries, the volume of DβS will grow too. That creates a new opportunity: regions with both lithium refineries and construction booms could pair the two flows instead of treating them as separate problems.
Can this concrete leave the lab?
No new material reaches building sites overnight. Standards, safety rules and insurance requirements all slow change in construction, often for good reasons.
For DβS-based geopolymer concrete, several hurdles remain:
- Proving reliable performance in real weather and real structures
- Ensuring a consistent supply of waste with predictable composition
- Convincing regulators to accept alternative binders in codes and guidelines
- Creating business models between miners, refiners and concrete makers
The technology also depends on geography. Not every country has lithium operations. That means the “waste-to-concrete” pipeline will work best in specific regions, such as Australia, parts of South America, and potentially areas of Europe starting to tap their own lithium reserves.
Other ways scientists aim to clean up concrete
The Australian project fits within a global race to cut concrete’s climate impact. Research labs and start-ups are pushing a wide range of ideas, some of them almost science fiction.
Self-healing and bio-based concepts
- Bacterial “biocement” powders that activate with water, urea and calcium to grow stone-like material on demand.
- Self-healing concretes that release enzymes from tiny capsules when cracks open, triggering repair reactions inside the material.
- Wood residue additives, studied in projects such as Rewofuel, which convert forestry waste into cement substitutes to shrink the amount of clinker used.
None of these options will replace traditional concrete overnight, yet they show how wide the search has become. The sector is moving away from a single material recipe towards a portfolio of lower-carbon solutions.
What “geopolymer” and “clinker” actually mean
Two technical words appear again and again in these debates.
Clinker is the black, nodular material that comes out of cement kilns. Manufacturers grind it into the fine powder we recognise as cement. Making clinker requires heating limestone and other minerals to around 1,400°C, which drives much of concrete’s carbon footprint.
Geopolymers skip the clinker. They use aluminosilicate sources such as industrial residues, mine tailings or calcined clays. An alkaline solution activates them, creating a hardened binder without the same level of heat or chemical CO₂ release. They still come with impacts but generally far less than classic cement.
What a city built with waste-based concrete might look like
Imagine a fast-growing coastal city in Australia in the 2030s. Electric cars fill the streets. Offshore wind farms send power ashore. Behind the scenes, a lithium refinery operates at the edge of town, feeding the battery industry.
Instead of building ever-larger waste dams, the refinery sends its DβS residue by rail to local concrete plants. New apartment blocks, tram lines and sea walls use geopolymer concrete blends that lock this waste into stable, durable structures.
Urban planners still need to cut consumption, extend building lifespans and reuse materials. Yet each slab and beam in this scenario carries a smaller carbon price, and the mining industry spends less effort managing unwanted by-products.
There are risks to weigh: long-term durability must match or exceed expectations; supply must remain consistent; communities near mines must be protected from dust and contamination during handling. Yet the basic principle is clear. Turning unavoidable waste into a resource can ease pressure both on the atmosphere and on the land.
