Unlike traditional concrete, zeolite concrete continues to interact with atmospheric CO₂ even after curing. CO₂ diffuses into the concrete pores and reacts with calcium (Ca) in the zeolite concrete to form calcium carbonate (CaCO₃), a stable compound that remains locked in the concrete.
Step-by-Step Breakdown
- Atmospheric CO₂ is absorbed by the cured zeolite concrete composite and reacts with calcium ions in zeolite.
- This forms calcium carbonate (Ca + CO₂ = CaCO₃) which is sequestered permanently, even if the concrete is demolished.
- The mineralization process creates nanoscale calcium carbonate particles, resulting in enhanced compressive strength.
Carbon Capture Efficiency
- A 15×15×15 cm zeolite concrete block can absorb approximately 1 mole of CO₂ (approximately 44 grams). One mole of carbon dioxide (CO₂) weighs 44.01 grams. Every mole of CO₂ captured from the atmosphere represents 44.01 grams of gas permanently sequestered. NOTE1: Carbon (C) has an atomic mass of about 12.01 g/mol. NOTE2: Oxygen (O) has an atomic mass of about 16.00 g/mol.
Eco-Friendly Benefits
- Carbon Sink: Zeolite concrete acts as a passive carbon sink, reducing ambient CO₂ levels.
- Durability: The formation of CaCO₃ improves microstructure and reduces permeability.
- Sustainability: It offers a dual benefit lower cement usage and active carbon sequestration.
Applications
- Ready-mix concrete.
- Precast concrete products.