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Abstract
This thesis studied the influence of the method and duration of applying direct or indirect sonication energy to disperse Nano silica as well as the influence of the method and duration of applying direct or indirect sonication energy and/or homogenizer to carbon Nanotubes to explain the inconsistency in the previous researches about the behavior of these Nano materials. Secondly, the effect of superplasticizer on the dispersion of Nano silica and carbon Nanotubes by optimizing the compressive strength of cement pastes was studied. Finally, a study was investigated in order to examine the coupled effect of Nano silica and carbon Nanotubes on the mechanical properties of cement mortars