自從工業革命以來，人為活動所產生的溫室氣體濃度明顯增加，溫室效應對於整個生態環境及全球氣候，已造成深遠的影響，因此二氧化碳捕捉與封存技術為重要的排放減量選項。而二氧化碳的地質封存技術實行中，常遭遇超臨界的溫度與壓力環境，使封存材料如套管水泥產生碳化反應，導致水泥材料的力學強度降低、膠結成分遭到破壞，進而造成二氧化碳洩漏的風險。
經由前人研究發現，添加碳化矽之套管水泥能有效抵抗超臨界二氧化碳環境之碳化問題，因此本研究針對套管水泥(API-G)添加不同配比(0.5%、1%、3%、5%)之碳化矽，將其置入超臨界二氧化碳環境反應釜中，參數設定45°C、25 MPa之超臨界二氧化碳環境，經由不同天數(0、14、28、56、84天)反應後，進行一系列試驗，探討隨著時間，不同配比碳化矽對水泥基本性質之變化，並且找出最佳之添加碳化矽配比。
研究結果發現API-G+3wt.% SiC之套管水泥，會使鈣矽比明顯降低，而微觀結構產生許多纖維狀及柱狀碳酸鈣與白色微小之碳化矽晶體，此晶體能堆積填補孔隙使其結構更加緻密，增強水泥強度並降低透性，有較佳之防止水泥碳化而弱化之能力。

Since the industrial revolution, the concentration of anthropogenic greenhouse gases has increased significantly. The greenhouse effect has had a profound impact on the entire ecological environment and the global climate. Therefore, carbon dioxide capture and storage (CCS) is an important to reduce carbon emission. In the geological storage of carbon dioxide technology, a supercritical temperature and pressure environment will be encountered, which will cause carbonization of the well cement in the oil well. This reduces the mechanical properties of the cement material, thereby causing CO2 leakage.
Previous studies have shown that the well cement with silicon carbide can be beneficial to the carbonization of the supercritical CO2 environment. Therefore, this study proposes to additions of different proportions of silicon carbide (0.5%, 1%, 3%, 5%) to well cement (API-G cement) in a supercritical CO2 reactor at temperature of 45°C and pressure of 25 MPa. This study has carried out a series of tests, after different reaction periods (before reaction, 14, 28, 56, 84 days). The changes of the basic properties of cement with different proportions of silicon carbide were observed after different reaction periods. Finally, this study proceeds to investigate the optimum proportions of silicon carbide in cement.
The results show that the addition of 3wt. % SiC in API-G cement will make a significant reduction in the ratio of calcite to silicon. Many fibrous and columnar calcium carbonate crystals and tiny white crystals produced in microstructures can fill the pores to make the structure densest, and enhance the strength of cement and reduce the permeability, preventing the cement carbonization in a better way.

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