Fundamental Studies on CO 2 Sequestration of Concrete Slurry Water Using Supercritical CO 2.

Sim, Sang-Rak; Ryu, Dong-Woo

To prevent drastic climate change due to global warming, it is necessary to transition to a carbon-neutral society by reducing greenhouse gas emissions in all industrial sectors. This study aims to prepare measures to reduce the greenhouse gas in the cement industry, which is a large source of greenhouse gas emissions. The research uses supercritical CO2 carbonation to develop a carbon utilization fixation technology that uses concrete slurry water generated via concrete production as a new CO2 fixation source. Experiments were conducted using this concrete slurry water and supernatant water under different conditions of temperature (40 and 80 °C), pressure (100 and 150 bar), and reaction time (10 and 30 min). The results showed that reaction for 10 min was sufficient for complete carbonation at a sludge solids content of 5%. However, reaction products of supernatant water could not be identified due to the presence of Ca(HCO3)2 as an aqueous solution, warranting further research.

SLURRY; CARBON dioxide; CARBON fixation; WATER use; SUPERCRITICAL water; CONCRETE; CLIMATE change; GREENHOUSE gases

Materials (1996-1944), 2022, Vol 15, Issue 1, p94

1996-1944

Academic Journal

10.3390/ma15010094