In a significant stride towards reducing the cement industry’s carbon footprint, researchers from Zhejiang University have unveiled a promising method to enhance carbon capture and storage (CCS) through direct aqueous carbonation (DAC). The study, led by Yanlin Zhang from the College of Civil Engineering and Architecture, explores how fly ash and sodium carboxylate can boost the performance of cement paste in absorbing CO2, offering a viable approach for accelerated carbon capture.
The research, published in the journal “Case Studies in Construction Materials,” investigates the maximum absorption amount (MAA) of CO2 in cement paste under DAC and compares its performance with additional carbon curing. Two CO2 injection methods—one-time and stepwise—were evaluated, with material properties analyzed using various techniques.
The findings are compelling. “We found that 3.5% CO2 was fully absorbed using stepwise injection at 0.1 MPa,” Zhang explains. This method not only improved the compressive strength and water resistance of the cement paste by over 20% but also achieved superior and faster CO2 sequestration compared to traditional carbon curing.
The implications for the energy and construction sectors are substantial. By integrating DAC with carbon curing, the researchers demonstrated a comprehensive CO2 sequestration strategy that doesn’t compromise the strength or durability of the cement. This dual approach enhances both internal and external carbonation, paving the way for more sustainable construction practices.
The study’s innovative use of fly ash and sodium carboxylate as additives is particularly noteworthy. These materials are not only effective in enhancing CO2 absorption but are also readily available, making the solution both efficient and cost-effective. The research highlights the potential for these additives to be integrated into existing industrial processes, facilitating a smoother transition to more sustainable practices.
The commercial impacts of this research are far-reaching. For the energy sector, the enhanced DAC method offers a more efficient and faster way to capture and store CO2, reducing the overall carbon footprint of cement production. For the construction industry, the improved mechanical performance and durability of the cement paste can lead to more robust and long-lasting structures.
As the world grapples with the urgent need to reduce CO2 emissions, this research provides a beacon of hope. By combining innovative technology with readily available materials, Yanlin Zhang and his team have demonstrated a practical and effective method for accelerating carbon capture in the cement industry. Their work not only advances the field of CCS but also sets a new standard for sustainable construction practices.
The study’s publication in “Case Studies in Construction Materials” underscores its relevance and potential impact on the industry. As researchers and practitioners continue to explore and refine these methods, the future of carbon capture and storage looks increasingly promising. This research is a testament to the power of innovation and collaboration in driving forward the energy transition.