题目：CO2 Mineralization and Utilization as Supplementary Cementitious Materials
报告人：潘述元 Dr. Shu-Yuan, PAN
Research Associate Carbon Cycle Research Center National Taiwan University
Date:1 June 2018 (Friday)
Venue:Room B211, College of Civil Engineering
PIC:Professor T.C Ling (林忠财)
Alkaline solid wastes from industries or coal-fired power plants have attracted great attention as an attractive feedstock for CO2 mineralization since they are relatively inexpensive ores. They are chemically unstable with high content of active components, e.g., lime (free-CaO), which can be readily hydrated in the presence of water and react with CO2 to form carbonates. The carbonate products can be utilized as a supplementary cementitious material (SCM) in concrete and/or cement mortar, which is a sustainable practice to make the cement industry more environmentally friendly. Normally, the use of SCMs in blended cement may reduce the early-age strength and increase the later-age strength of the concrete, as compared with the use of pure OPC. However, a carbonation product such as CaCO3 is superior to the original CaO or Ca(OH)2 in alkaline solid wastes, in terms of physical properties. Since the CaCO3 is a highly elasticity-resistant material, it can improve early strength of cement mortar. CaCO3 also could create vacuum within the cement matrix; therefore, liquid cannot easily intrude into the structure to induce corrosion or damage. In this presentation, the challenges and opportunities in CO2 mineralization and utilization as SCMs are comprehensively illustrated.