الفهرس 
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Abstract
Polymer concrete (PC) is characterized by excellent resistance to the chemical aggressions and a good adhesion with various substrates. Moreover, PC showed very good mechanical strengths, in particular under tension, higher than Portland cement concrete. Due to its qualities, PC, consisting of natural aggregates bonded with a thermosetting resin as a matrix, is recommended for applications where chemical resistance is needed for serve in aggressive environment conditions.
In this research, the effects of adding MWCNTs and modified nanoclay (Cloisite 30B) on the mechanical properties of epoxy polymer were investigated. Subsequently, the mechanical properties of polymer concrete (PC) made with modified epoxy were also studied. The nanomaterial dispersion was achieved by ultra-sonication technique. Therefore, optimum sonication output power and time for achieving the highest d-spacing of nanoclay layers were obtained. In all production processes, the d-spacing was increased from 1.8 nm to about 4.3 nm and thus the intercalated nanocomposites were fabricated. In addition to XRD, the dispersion state and the d-spacing of nanoclay particles were observed using a transmission electron microscope (TEM). Finally, by adding the optimum amounts of MWCNT or nanoclay to the PC, its mechanical properties were compared with conventional ones. Modifying the epoxy matrix with 1 wt% of MWCNT reinforced the flexural strength of the fabricated PC samples with 50%.