Influence of polysulfide rubber and filler on the properties of freeze-thaw resistant adhesive for bridge reinforcement
Adhesive was prepared by using bisphenol A epoxy resin,bisphenol F epoxy resin,reactive diluent,polysulfide rubber,silane coupling agent,polyetheramine,modified cyclic amine,phenolic amine,accelerator,silica micro powder,and fumed silica as raw materials.The effects of curing agents on the curing reaction of epoxy resin were studied by using DSC method,and the effects of polysulfide rubber,filler,and epoxy resin NPEF-170 on the tensile strength,bending strength,compressive strength,tensile shear strength,and other properties of the adhesive were further investigated.The research results showed that,(1)As the filler content(40%-55%)increased,the tensile strength of the adhesive showed a trend of first decreasing and then increasing when the addition amount of polysulfide rubber was 0 and 10 parts,respectively.When the addition amount of polysulfide rubber was 20 parts,the tensile strength of the adhesive showed a trend of first increasing and then decreasing.Therefore,when the addition amount of polysulfide rubber was 20 parts and the filler content was 45%,the curing shrinkage of the adhesive decreased,the toughness increased,and the internal stress decreased.At this time,the tensile strength of the adhesive was the highest(38.7 MPa).(2)When the filler content was 40%and 45%,the resin content was relatively high,and the effects of the addition amount of polysulfide rubber on the bending strength of the adhesive were greater than that of the filler content.When the filler content was 50%and 55%,the resin content was relatively low,and the effects of the addition amount of polysulfide rubber on the bending strength of the adhesive were smaller than that of the filler content.(3)With the increase of filler content,the compressive strength of the adhesive showed an increasing trend,but the magnitude was not significant.With the addition of polysulfide rubber,the compressive strength of the adhesive decreased,which had a significant impact on its performance.However,within 20 parts,the compressive strength was still higher than 70 MPa.(4)When the filler content was 45%,the resin content of the adhesive was relatively high,the toughness was good,reaching 17.6-18.7 MPa,and the tensile shear strength was high.(5)The freeze-thaw cyclic test showed that two formulas(A-1 and A-2)met the requirements of JTG/T J22-2008 and GB 50728-2 011standards,which stipulated that the percentage of strength reduction before and after the freeze-thaw cyclic test should not exceed 5%.
adhesive for bridge reinforcementpropertyfreeze-thaw resistantpolysulfide rubberfiller
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