Carbon-Capturing Concrete Debuts in Nairobi: How Carbon-Mineralized Paving Blocks Work
mjengohub.co.keA pedestrian walkway in Nairobi's Upper Hill district now features paving blocks made with carbon-capturing concrete. The blocks were produced by Kenyan firm ZEN Carbon using CO2 captured from the air by Octavia Carbon. The gas is permanently mineralized into the concrete, locking it away as a solid. The 76-square-meter pilot site traps about 37.73 kg of CO2. Early tests show the blocks can be installed with standard tools and hold up under daily foot traffic. The project aims to gather real-world durability data before scaling to larger infrastructure. Cement production is a major source of global emissions, so low-carbon alternatives like this are gaining attention from policymakers and contractors. Questions remain about long-term performance, cost at scale, and whether clear engineering standards will emerge. The pilot is a concrete step toward lower-carbon urban construction, but widespread adoption will depend on more field data and procurement frameworks that reward low-emission materials.