Study On Mechanical Properties Of Cement-based Materials Based On Synergistic Effect Of Slag Powder And Graphene Oxide

As a new type of nanomaterial containing a large amount of reactive functional gro ups,graphene oxide can be incorporated into the cement matrix to accelerate the hydrati on process,significantly optimize the microstructure and improve the mechanical prope rties.However,previous studies have shown that single-doped graphene oxide can degr ade the fluidity of the slurry without using engineering applications.The unique physica l properties of mineral admixtures such as slag powder can significantly improve the per formance of the cement matrix,but on the other hand,it will also reduce the early streng th.To this end,this paper takes compound slag powder and graphene oxide cement-base d materials as research objects,and studies the effects of graphene oxide content,slag p owder content and water-to-binder ratio on its fluidity and mechanical properties,and a nalyzes its water.Chemical products and micromorphology,explaining the synergistic mechanism of slag powder and graphene oxide.The main content comes down to the following aspects:Firstly,based on the orthogonal experimental theory,the fluidity of cement matrix under the synergistic effect of slag powder and graphene oxide was tested.The influenc e of graphene oxide content,slag powder content and water-to-binder ratio on the fluidit y was analyzed.The results show that with the increase of the amount of graphene oxide,the fluidity decreases;with the increase of the amount of slag powder,the fluidity incre ases;with the increase of water-to-binder ratio,the fluidity increases.Based on the rang e analysis of orthogonal test,it is known that the influence of graphene oxide content onthe fluidity of cement-based materials is the greatest,the influence of water-to-binder ra tio is the second,and the influence of slag powder content is the smallest;and the best fi t based on fluidity The ratio of the graphene oxide is 0,the slag powder content is 50%,and the water-to-binder ratio is 0.37.Secondly,based on three-point bending and compression test,the flexural and com pressive properties of cement-based materials at 3d,7d,28 d,49d and 60 d were studied under the synergistic effect of slag powder and graphene oxide.The influence of factors such as dosage,slag powder content and water-to-binder ratio on mechanical properties.The results show that with the increase of the amount of graphene oxide,the flexural str ength increases.With the increase of the amount of slag powder,the flexural strength de creases before 28 days,and when it reaches 49 d and 60 d,the flexural strength increases first.After reduction;as the water-to-binder ratio increases,the flexural strength decreas es.With the increase of GO content,the compressive strength increases.With the increa se of slag powder content,the compressive strength decreases before 28 days,and when it reaches 49 days and 60 days,it shows a trend of increasing first and then decreasing.The amount of slag powder is 40% to reach the maximum;as the water-to-binder ratio ratio increases,the compressive strength decreases.Finally,based on scanning electron microscopy(SEM),the hydration products and microstructure of cement-based materials were studied when slag powder and graphene oxide were synergistically.The results show that slag powder and graphene oxide are co mpared with those of graphene oxide alone.The synergistic effect of the cement-based material microstructure is more compact.Based on the comprehensive balance method,the proposed optimal ratio is proposed considering the fluidity and mechanical propertie s.The dispersion effect,filling effect and micro-aggregation effect of slag powder and g raphene oxide on the cement matrix are further explained from qualitative and quantitati ve perspectives.Synergistic enhancement mechanism.The related results have certain r eference value and practical significance for the theoretical research and engineering ap plication of the new cement-based materials.