CO2-driven Superhydrophobic Carbon-sink Concrete

Principle Investigator:
Ir Prof. POON Chi Sun, Michael Anson Professor in Civil Engineering; Chair Professor of Sustainable Construction Materials; Head of Department of Civil and Environmental Engineering; Director of Research Centre for Resources Engineering towards Carbon Neutrality

The excessive emission of CO2 poses a significant environmental challenge. Our CO2-driven superhydrophobic carbon-sink foam concrete (SCFC) revolutionises the capture and use of carbon in construction.

By incorporating ultra-stable CO2 foam – 50 times more stable than commercial alternatives – into a high-strength, low-carbon paste, SCFC achieves exceptional performance. The material captures over 100 kg of CO2 per cubic metre through internal carbonation, creating a rough microstructure that enables superhydrophobicity, or water resistance.

SCFC offers more than three times the strength of traditional foam concrete, along with superior durability, self-cleaning capabilities, thermal insulation and soundproofing properties.

This innovation addresses critical environmental challenges by reducing carbon emissions while providing energy-efficient, sustainable solutions for modern green buildings. SCFC enhances structural performance and reduces ecological impact. It exemplifies multifunctional design for a low-carbon future.