Study on the Effect of Alkali-activation Slag on the Interface of Cement Concrete
In response to the impact of alkali activated slag on the mechanical and interfacial properties of cement con-crete,a variable dosage method was used,with replacement rates of 0%,10%,20%,and 30%for alkali activated slag.Scanning electron microscopy was used to test the mechanical properties and micro interfacial characteristics of alkali activated slag on cement concrete.The results show that:① the axial compressive strength of alkali activated slag cement concrete decreases with the increase of slag content,while the cubic compressive strength increases with the increase of slag content.② The higher the peak stress of cement concrete specimen with alkali activated slag content,the steeper the stress-strain curve.The stiffness and elastic modulus of the lower content sepecimen are lower,while the stress-strain curve of the higer content specimen has the smallest decreasing slope.Its ductility and deformation ability are better than other specimens.Alkali activated slag can penetrate fine cracks in cement concrete,thereby improving the splitting tensile strength of the matrix.③ There are microcracks and pores caused by drying shrinkage in the microstructure.With the increase of alkali activated slag content,the number of microcracks and pores in the microstructure of cement mortar decreases.④ The interface of alkali activated slag in higher group is denser than that in higer content specimen group,with fewer microcracks.More gel materials are attached to the sur-face of alkali activated slag and holes,and these gel materials are basically distributed along the interface.
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