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¡¡¡¡Abstract£ºIn order to study the influence of stone powder on the mechanical properties and durability of concrete,the mechanical properties and durability of concrete with different lithology,fineness and dosage were studied based on orthogonal experiment. The results show that the effect of stone powder type,fineness and dosage on the compressive strength of concrete at 7 d and 28 d is basically the same. The influence of stone powder content was the most significant. The 28 d compressive strength of 30% and 20% stone powder content decreased by 23. 1% and 12. 8% compared with 10%. The type and fineness of stone powder have little influence on the compressive strength of concrete,and the influence of stone powder type is mainly controlled by the activity of stone powder. the influence of stone powder content and type on 90 d electric flux of concrete is significant.With the increase of stone powder content,the electric flux of concrete increases,and its resistance to chloride ion decreases.With the increase of the specific surface area,the electric flux decreases. The size of dentsu in different lithology is as follows:red sandstone stone powder > tuff stone powder > limestone powder; the microstructure of powder from different lithologies reflects the chloride ion resistance of concrete. The 90 d electric flux of the mixed concrete with different stone powder and 5%wollastonite is basically less than 1000 C,which indicates that the mixed concrete with stone powder and wollastonite has good resistance to chloride ions.

¡¡¡¡Keyword£ºlithology; fineness; the amount of stone powder; mechanical properties; electric flux;

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