Enhancement of Corrosion Resistance of UHPC Wet Joints in Carbonized Environments by Styrene-butadiene Emulsions
The assembled wet joint interface is the weak position of the structure,in order to enhance the performance of the wet joint interface in underground service,the ultra-high performance concrete(UHPC)grouting was prepared to study the effect of butylbenzene emulsion on the working performance and compressive strength of the UHPC,and the design of the wet joint structure to study the mechanics,carbonation resistance and microstructure of the wet joint structure of the UHPC with different butylbenzene emulsion dosage.The results showed that with the increase of butylbenzene emulsion doping,the flow degree and compressive strength of UHPC decreased.The compressive strength of UH-PC wet joint structure mainly depended on the UHPC matrix,while the doping of butylbenzene emulsion improved the interfacial bond strength,and the 4%butylbenzene emulsion was the most effective in enhancing the bending performance of the wet joint structure.Under the carboniza-tion effect,the butylbenzene emulsion reduces the carbonization depth of UHPC and interface,and lowers the corrosion potential of steel rein-forcement,which is conducive to enhancing the corrosion resistance of the wet joint interface.Combined with the microstructural analysis,it can be seen that 4%butylbenzene emulsion can refine the UHPC pore structure,and the polymer film formed by the emulsion may also be one of the reasons for the enhancement of interfacial properties.
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