Study on the Modification Effect of Epoxy Resin Adhesive Used in Bridge Concrete Crack Repair
In order to make the epoxy resin adhesive have proper viscosity,fluidity and controllability in the construction process,the modifica-tion effect of epoxy resin adhesive used in bridge concrete crack repair is analyzed from the aspects of mechanical properties and thermal conductivity.The polyurethane is used to change the mechanical properties of epoxy resin,and the addition of boron nitride is adopted to change the thermal con-ductivity of epoxy resin.The changes in mechanical performances of epoxy resin with different mass fractions of polyurethane are analyzed,as well as the changes in thermal conductivity of epoxy resin with different mass fractions of boron nitride.The test results show that when the amount of polyurethane is 16％,the modified epoxy resin has the highest tensile strength,compressive strength and shear strength,more uniform pore structure,and higher stress dispersion effect.When the amount of boron nitride is 20％,the thermal conductivity of modified epoxy resin is most suitable for modified epoxy resin,which can alleviate the influence of environment on epoxy resin.When 16％polyurethane and 20％boron nitride are used to modify epoxy resin adhesive,the bearing capacity of bridge is higher after the concrete cracks being repaired by epoxy resin.
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