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.
维普
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