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.