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Polymer mortars such as polyester, epoxy and polymethyl methacrylate mortars are widely used in the construction industry. The polymer mortars are prepared by use of polymeric binders, fillers and aggregates, and the properties of the polymer mortars are considerably affected by the properties of polymeric binders used. A main component of the binder for the polyester mortar is unsaturated polyester resin. Styrene monomer as a diluent is sometime added to the binder. However, the strength of the polyester mortar is decreased when much styrene monomer is added. On the other hand, methyl methacrylate monomer as a main component of the binder for the polymethyl methacrylate mortar requires some crosslinking agents to improve the strength properties of the mortar. The unsaturated polyester resin can be added to the binder as an ingredient of shrinkage-reducing agent for the binder. In the present paper, the combined use of an unsaturated polyester resin and vinyl monomers as the binders for polymer mortars is examined. Styrene monomer or methyl methacrylate monomer with and without a crosslinking agent is added to the unsaturated polyester resin to prepare the binders for the polymer mortars. Basic properties such as working life, strength, stress-strain relationship in compression and modulus of elasticity of the polymer mortars are discussed. In conclusion, such basic properties of the polymer mortars are markedly affected by the formulations of the binders used. In the formulations of the binders, the combined use of the unsaturated polyester resin and methyl methacrylate monomer is found to be reasonable rather than the combined use of the unsaturated polyester resin and styrene monomer.
