Preparation And Property Of Waterborne Epoxy Based Polymer Concrete

This thesis deals with the epoxy resin modified concrete. Firstly, we have preparedself-emulsified epoxy resin in aqueous solution by free radical graft copolymerization. Then,we have used the epoxy emulsion to modify cement concrete, where the polymer and cementform interpenetrating networks. The structure and mechanical properties of the compositeshave been studied. The main results are as follows:1) We have prepared self-emulsified epoxy resin by free radical graft copolymerization ofacrylic acid (AA)(hydrophilic monomer), butyl acrylic (BA)(soft monomer) and methylmethacrylate (MMA) or styrene (St)(hard monomer). The Fourier transform infraredspectrometer (FTIR) results indicated that the monomers was successfully grafted onto epoxyresin. The surface tension test shows the epoxy resin can reduce the surface tension of waterand can form stable emulsion. We have also studied the reaction conditions, emulsificationprocess and explore the effects of temperature, AA content, solid content, type of epoxy, saltagent, pH on the stability of emulsion. The film performances were also examined.2) We have prepared polymer concrete by mixing the epoxy emulsion with cement concrete.The influences of maintenance condition and curing agent on the performance of thecomposite materials have been investigated. The studies indicate that polymer concrete showsmixed curing, and the hydroxyl ions which come from cement hydration reaction can act ascuring agent when the polymer-cement ratio is low. The DSC and XRD results show that theaddition of epoxy emulsion can slow down the hydration reaction of cement concrete. Wehave examined the mechanical performance and water absorption of the polymer concrete.Polymer concrete exhibits good performance at polymer/cement ratio of~0.03/1(w/w), andthe optimum ratio is0.02/1(w/w) where the tensile strength shows the maximum and thewater absorption or the loss of compression strength shows the minimum.