Development of Carbon Consuming Concrete (CCC) using CO2 captured nanobubble water

Nanobubble water with the ability to capture carbon dioxide (CO2) was used as the mixing water for the development of Carbon Consuming Concrete (CCC). The mechanical properties, volume stability, and pore structures were initially evaluated. Scanning electron microscope (SEM) image was analyzed to confirm formation and calcium component on the surface. Differential thermogravimetry (DTG) analysis and nuclear magnetic resonance (NMR) spectroscopy were used to evaluate the reactivity of cement according to mixing water type. The ability was confirmed in priority that convert calcium hydroxide (CH) into calcium carbonate (CaCO3) by utilizing abundantly captured CO2. The nanobubble increased the calcium content and ratio of micropores, while the total porosity decreased when CO2 gas was injected. Depending on the mixing water type, each specimen showed strength in the production of different major components (C-S-H, CH, and CaCO3), affecting the compressive strength development, and the injection of CO2 gas also affected shrinkage behavior. •Concrete with CO2-capturing nanobubbles achieves excellent compressive strength.•Nanobubbles in concrete suppress the carbonation shrinkage.•The utilization of nanobubbles improves C-S-H production.•Abundant CO2 condition increases the chance of calcium ions to react.•A synergistic effect of nanobubbles and CO2 leads to higher CaCO3 production.