Physico-chemical studies of gamma-irradiated polyester-impregnated cement mortar composite

The effect of impregnation time on the physico-chemical and mechanical prop erties of polyester-cement mortar composite has been investigated. The samp les were soaked in unsaturated polyester resin containing 40% styrene monom er at impregnation times ranging from 1-15 hours and then exposed to SO kGy of gamma-irradiation. The effects on polymer loading, compressive strength , apparent porosity, and water absorption in addition to IR spectra and TGA of the samples were studied. It was found that, the polymer loading and co mpressive strength increase with the increased of soaking time up to 4 hour s and there is no significant improvement of the polymer loading and streng th. Whereas, the apparent porosity and water absorption behave in an opposi te direction. These are attributed to the presence of polymer in the pores of the samples. IR spectra showed that, new bands appeared as result of the reaction between polyester and set cement. TGA showed that, the polyester cement composite has higher thermal stability as a compared to irradiated p olyester.