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While mineral concretes belong to the oldest composites used by mankind, in an increasing number of applications their compression strength &#963;c and compressive strain at yield point &#949;Y are insufficient. Better results can be achieved with polymer concretes (PCs). We use a polymer concrete (PC): an unsaturated polyester resin as the matrix, CaCO3 and silica sand. Moreover, we have applied two further methods to improve its mechanical properties: reinforcement with polyester fibers and gamma irradiation with a 60Co source. A non-irradiated PC with 5 wt% CaCO3 has &#963;c = 74 MPa, an irradiated sample with optimized CaCO3 contents 122 MPa. Scanning electron micrographs show that irradiation increases the interface areas between the fibers and the matrix. Improvements from 47 to 176% in &#949;Y values are achieved with respect to the conventional PC without fibers, non-irradiated and containing only one mineral component

Effects of polyester fibers and gamma irradiation on mechanical properties of polymer concrete containing CaCO3 and silica sand