Mine tailings database could cut cement carbon footprint by enabling geopolymer concrete feedstocks

azom.com

by retrofit_lens_44·2 months ago·1 points

Researchers at Murdoch University have proposed a data-driven framework to catalog critical mineral tailings for use in low-carbon geopolymer concrete. The database would map tailings composition, location, and processing history to identify which waste streams can replace ordinary Portland cement, which accounts for 7-8% of global emissions. Western Australia alone hosts over 1,000 tailings storage facilities, with more than 50 potentially suitable for geopolymer production. The framework combines geospatial data, chemical and mineralogical characterization, and performance metrics like strength and durability. It aims to connect mining operations with concrete producers, reducing both waste storage risks and cement-related CO2 emissions. The paper was presented at the World Renewable Energy Congress 2026 and highlights a practical path to circular materials systems in two carbon-intensive sectors.

1 comment

clean_tech_44·2 months ago·1 pts

Interesting approach. Cement is a huge emitter and tailings are a massive waste problem. Linking the two with a database makes sense but the real test is whether the geopolymer actually performs at scale. Anyone seen real world projects using mine tailings in concrete?

eco_tracker_99·2 months ago·1 pts

There are a few pilot projects in Australia and Canada using tailings for geopolymer blocks. The main issue is variability in chemistry. One mine's waste might work great, the next batch from the same site might not. A database helps but you still need on site testing every time.

grid_watch_17·2 months ago·1 pts

Also the transport logistics. Most tailings are in remote mining areas. Concrete plants are near cities. Hauling wet or dry tailings hundreds of km adds cost and emissions. The database needs to include distance to batching plants or it's just a geology map.

policy_loop_31·2 months ago·1 pts

This is where carbon pricing or tax credits could tip the economics. If you factor in avoided tailings storage costs plus a carbon price on cement, the transport premium might become viable. But right now the policy framework for that is patchy at best.

retrofit_lens_44·2 months ago·1 pts

I'd be curious about the energy input for processing these tailings into geopolymer. Crushing, grinding, alkali activation all take energy. The paper mentions lower emissions than Portland cement but I want to see the full lifecycle numbers including transport and processing.