Progress in Studying Affecting Factors and Alkaline-Activated Reaction of Activity of Metakaolin
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摘要: 偏高岭土具有能耗少、钙含量较低、可耐二氧化碳腐蚀等优点，有取代普通硅酸盐水泥的潜力。通过总结偏高岭土活性影响因素、碱激发反应的研究进展，分析了将偏高岭土应用于固井行业的可行性。总结了目前研究的偏高岭土活性影响因素，包括煅烧温度、煅烧时间和偏高岭土中氧化铝、二氧化硅含量等。煅烧温度过高或过低、煅烧时间过长或过短，偏高岭土的活性都较低。同时，介绍了碱激发反应影响因素及碱激发反应产物的组成。并针对目前研究中存在的不足，讨论了未来研究方向为在固井领域推广应用偏高岭土体系，今后研究应注重揭示各实验因素对偏高岭土体系稠化时间的影响规律，及如何在不引入含钙量较高的物质的基础上，提高偏高岭土体系的抗压强度。Abstract: Metakaolin has many advantages such as low energy consumption, low calcium content and resistance to CO2 corrosion, and is a potential substitute for conventional silicate cement. By summarizing the progresses made in studying the factors affecting the activity of metakaolin and the alkali-activation reaction, the feasibility of applying metakaolin in well cementing is analyzed. In this paper the factors affecting the activity of metakaolin are summarized, such as calcination temperature, calcination time as well as the aluminum oxide and silica contents of metakaolin. If the calcination temperature is too high or too low, and if the calcination time is too long or too short, the activity of the metakaolin will be low. This paper also introduces the factors affecting the alkali-activation reaction and the components of the products of alkali-activation reaction. It is thought that shortcomings exist in the present research work, and the future researches should be focused on the application of metakaolin in well cementing. In future researches, more attention should be paid to the effects of experimental factors on the thickening time of metakaolin cement slurries and to the methods of how to enhance the compressive strength of the metakaolin slurries without introducing high-calcium materials.
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Key words:
- Metakaolin /
- Geopolymer /
- Activity /
- Well cementing
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