Self-healing concrete with biomineralization-enhanced construction waste for long-term decarbonization

The biomineralization technology will be applied to accelerate carbonization and enhance RAs, where CCB will be enriched to utilize CO2 for calcite precipitation, decreasing the porosity and increasing the strength of RAs. Subsequently, these biomineralization-enhanced RAs will be utilized as raw materials to prepare low-carbon self-healing concrete. In the preparation of marine concrete, CCB will be incorporated again to achieve self-healing property, which will form a biomineralized film to enhance the marine corrosion resistance of concrete structures and further utilize air and marine CO2 to repair microcracks in the usage stage. The enhanced corrosion resistance and self-healing significantly increase the lifespan of concrete structures, which decreases energy consumption in repair and the need for new concrete materials, significantly contributing to global decarbonization.

(1) Microbially Accelerated Carbonization without requiring a high-pressure environment.

(2) The self-healing concrete has decreased porosity, increased strength, enhanced corrosion resistance, and improved durability.

(3) The CCB incorporated in concrete can provide self-healing property, which long-term utilizes air and marine CO2 to repair microcracks.

(4) The self-healing concrete holds significant overall cost savings.

This technique holds promise for application in diverse marine environments as well as other corrosive settings, including sewer systems, wastewater treatment plants, and cooling towers.