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Composite materials consist of merging two materials or more are different in mechanical and physical properties, The aim of research is to study the effect of changing in the reinforce percentage by fly ash in mechanical Properties ,for composite material consist of NBR rubber reinforced by carbon black (40pphr) and fly ash (0,15,18,20,23,26,30 pphr), which included tensile strength, modulus, elongation, hardness, tear, resilience, after reinforced NBR rubber with different weight percentage from fly ash and study the effect on above Properties as illustrated in the diagrams

The Effect of Adding Waste of Cement "Fly Ash" in some of the Mechanical Properties of NBR Composites