Investigation on the fast carbon dioxide sequestration speed of cement-based materials at 300 °C–700 °C

Abstract In recent years, the increasing global temperature, caused by excessive carbon dioxide emission, has put a significant threat on the earth’s environment. Therefore, the development of fast carbon dioxide sequestration technologies is urgently needed. In this study, a high-temperature carbonation technique has been proposed by using cement-based materials. The carbon dioxide sequestration efficiencies of cement paste were tested and evaluated from 300 °C to 700 °C, exhibiting different characteristics compared with that at ambient temperature, with optimum carbonation temperature at 600 °C. The operating parameters, such as carbonation time, sample size, vapor content, and water to cement ratio, which play a significant role in the carbonation reaction, have also been investigated and compared with that at ambient temperature. It was found that the high efficiency of carbon dioxide sequestration could be achieved in the samples with large size and low water to cement ratio.