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An industrial demonstration study on CO2 mineralization curing for concrete
Tao Wang1, Zhenwei Yi1, Jiayi Song1
1State Key Laboratory of Clean Energy Utilization, Zhejiang University, China.
Iscience
|May 6, 2022
Summary
Mineralization curing (CMC) technology captures 10,000 tons of CO2 annually by utilizing industrial waste in concrete production. This innovative process significantly reduces carbon emissions compared to traditional methods.
Area of Science:
- Materials Science
- Environmental Engineering
- Chemical Engineering
Background:
- Traditional autoclaved curing of concrete contributes to significant carbon emissions.
- Utilization of industrial solid wastes in construction materials is an emerging area for sustainable development.
Purpose of the Study:
- To demonstrate an industrial-scale mineralization curing (CMC) process for concrete production.
- To develop a sustainable concrete formula using local solid wastes.
- To evaluate the environmental impact and efficiency of the CMC process.
Main Methods:
- Retrofitting a traditional autoclaved curing plant for a 10,000 ton-CO2/y CMC process.
- Developing an industrial concrete formula incorporating fly ash, slag, and carbide slag.
- Implementing a step pressure-equalizing procedure for enhanced carbonation.
Main Results:
- Observed high-temperature accumulation (up to 140°C) due to exothermic carbonation.
- Achieved a CO2 conversion ratio of >98% and efficient exotherm recycling.
- Reduced CO2-equivalent emissions by 182 kg/m3-product compared to autoclaved curing.
Conclusions:
- The demonstrated CMC process offers a sustainable alternative for concrete production.
- Direct CO2 sequestration via mineralization accounts for a substantial portion of emission reduction.
- The use of industrial solid wastes in CMC contributes to a circular economy.
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