The nanoparticles and nanostructures such as nano silica, nano metakaolin, titanium dioxide and aluminium oxide nanoparticles, graphite nanomaterials, carbon nanotubes are used for modification of composite materials in construction industry. The considerable attention of researchers is focused on the investigation of cement systems modified by carbon nanotubes (CNT). The present research describes the generalized data about modification of cement systems by CNT suspension in fresh and hardened state. The influence of carbon nanotubes on setting time of cement paste, rheological and mechanical properties of nanomodified cement systems are demonstrated in the present research.