Objective To improve the effect of gas extraction and solve the problem of slow development of early strength of traditional sealing cement.Methods A new sealing material was prepared by using super absorbent poly-mer(SAP),nano ferrite,and ferric sulfate.The structure analysis and performance test of cement samples were car-ried out by means of a compressive strength test,fluidity test,setting time test,X-ray diffraction(XRD),thermo-gravimetric analysis and scanning electron microscope(SEM).The effect of ternary early strength agents on cement-based sealing materials was studied.Results Compared with the blank group,the ternary early strength agent shortened the setting time of cement and improved the early strength of cement.The compressive strength of 1 day was 10.13 MPa,which was 51.87％higher than that of the blank group.Conclusion The self-curing effect of SAP and the crystal nucleus effect of nano ferrite will promote the formation of cement hydration products.At the same time,the iron ions in iron sulfate and nano ferrite are high valence cations,which have a compression effect on the double electron layer formed by C-S-H.It further promotes the formation of C-S-H gel,accelerates the hydration rate of cement,generates more hydration products,fills the pores,increases the compactness of cement,improves the early strength performance and provides a new idea for the design of cement early strength agent.
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