Basalt-Based Cement Process Could Reduce CO2 Emissions by 80%

A Shift from Limestone

Traditional Portland cement production relies on the combination of limestone with materials such as shale, clay, or sand, which are ground into a powder. However, new research indicates that limestone may not be the only viable source for producing cement.

Scientists are proposing a shift toward using silicate rocks, specifically basalt, as a primary raw material. This alternative method aims to address the significant environmental impact of the current manufacturing process, which is a major source of global carbon dioxide (CO2) emissions.

Environmental and Energy Impact

Substituting limestone with basalt could lead to a substantial reduction in the industry's carbon footprint. According to reports, a basalt-powered cement process has the potential to slash both energy use and CO2 emissions by as much as 80%.

Producing cement from silicate rocks rather than limestone is expected to lower energy requirements. In addition to the reduction in greenhouse gas emissions, the process of using silicate rocks may generate valuable by-products.

The Global Scale of Cement Emissions

Cement production has a disproportionate effect on the climate. It contributes approximately 8% of all human-made greenhouse gas emissions.

Other efforts to decarbonize the industry include the use of LC3, a material used to substitute clinker in cement. Implementing LC3 could reduce CO2 emissions by 40%, which could save up to 500 million tons of emissions by 2030. This need for greener materials is amplified by an expected rise in cement demand to build infrastructure and housing for a growing global population, particularly in the Global South.

Future Outlook

As the global community works to alter the trajectory of climate change, the focus has largely been on reducing reliance on fossil fuels. However, cement production has been identified as a major source of CO2 emissions that the industry is working to address.

The transition to silicate-based materials like basalt represents one potential pathway toward dramatically lower-carbon cement production.