Development of Leakage Resistant Well-Cements for Geo-Sequestration of Carbon Dioxide Application using Alkali Activated Slag and Geopolymer Cements

目前生命面临的最大威胁是二氧化碳（CO2）排放造成的气候变化。正如最近的森林大火所证明的那样，极端天气的频率和强度都在增加，预计除非迅速实施碳减排战略，否则情况会变得更糟。地质封存是一种将二氧化碳长期捕获并储存在地下深处的技术（大约1000年）。它为大幅度减少二氧化碳排放提供了最大的希望。然而，在压力下储存的二氧化碳盐水是酸性的，长期存在溶解用于密封管井的水泥而泄漏的风险。该项目将开发一种新型的可替代水泥，这种水泥具有耐酸性，并且不会让二氧化碳通过密封的井泄漏。

The biggest threat facing life now is climate change due to carbon dioxide (CO2) emissions. Extreme weathers are increasing in frequency and intensity, as evidenced by recent bushfires, and it is predicted to get worse unless carbon mitigation strategies are quickly implemented. Geo-sequestration is the technology of capturing and storing of the CO2 deep below ground for long time (>1000 years). It offers the best hope for large reductions of CO2 emissions. However, CO2-brine stored under pressure is acidic and has the risk of leaking in the long term by dissolving the cement used to seal the pipe wells. This project will develop alternative novel cements which are acid resistant and will not allow CO2 to leak through the sealed wells.