MICROSTRUCTURE OF PHENOLIC RESIN CEMENT CONCRETE

摘要

Studies on cement concrete microstructures are carried out in order to explain experimentallyrnobserved phenomenon and for constitutive modelling of concrete at the macroscopic level.rnMany investigations have already been conducted to investigate the structure propertyrnrelationships before and after the addition of external agents to the cement concrete. This paperrndescribes the study and analysis of the microstructures of phenolic resin cement concrete andrntheir effect on the macroscopic properties. Resorcinol formaldehyde and m-cresol formaldehydernresins were used to form the composite. The cementatious phase of the cured phenolic resinrncement concrete samples were etched and the resulting polymer network was analysed under arnScanning Electron Microscope. Thermal and chemical analyses of the phenolic resin cementrnconcrete were also carried out to determine the interactions between the polymer and cementrnconcrete phases and the extent of hydration after the addition of polymer into the compositernnetwork. Investigations on resorcinol formaldehyde cement concrete revealed that therninteractions between resorcinol and the Ca~(2+) ions in the cement concrete resulted in a strongrnchemical bond between the resin and the cement. The final composite had mechanical andrnchemical resistant properties far better than virgin cement.