Preparation and properties of nano-modified epoxy pressure injection adhesive for concrete crack repair
The epoxy resin was modified by adding nanomaterials in order to obtain concrete crack repair materials with higher strength and better ductility.The effects of the amounts of curing agent and nano-TiO2 and ultrasonic dispersion on the properties of nano-modified epoxy resin were studied by tests of viscosity and mechanical properties.The results showed that the optimal dosage of curing agent 593 was 28％of the mass of epoxy resin E-51,and the elongation at break,bending strength,impact toughness and positive tensile bonding strength of the composite were 158.1％,115,4％,167.1％and 180.4％of the pure epoxy resin,respectively.After 60 min ultrasonic dispersion treatment,the bending strength,impact toughness and positive tensile bonding strength of 1％nano TiO2/EP pressure injection adhesive were 111.1％,106.9％and 109.5％of those before ultrasonic dispersion,respectively.By scanning electron microscopy(SEM),it was found that the toughness of nano-modified composite was significantly improved compared with that of pure epoxy resin.
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