Chinese scientists have created a unique type of cement that reflects sunlight and can reduce building temperatures by more than 5°C, helping cut air conditioning costs and combat climate change.
Researchers from Southeast University in China developed this innovative cement using photonic architecture and self-organized ettringite crystals. This structure enables record-breaking solar reflectivity (96.2%) and high infrared emissivity (96%).
Tests showed that at an air temperature of 38.4°C, the surface of the cooling cement remained 5.4°C cooler than conventional coatings. Under direct sunlight, traditional cement heated up to nearly 59°C, while the new material stayed significantly cooler.
In addition to its cooling properties, the cement demonstrates high strength, resistance to ultraviolet radiation and extreme conditions, and can be produced cost-effectively at scale. According to the scientists, widespread adoption of this material could greatly reduce energy consumption for cooling and become an important step toward lowering the carbon footprint of cities.
