JAROLÍM Tomáš Brno University of Technology

Spoluautoři LABAJ Martin, HELA Rudolf

This paper deals with very popular topic of using nanomaterials in building industry. Of all current scientific areas, nanotechnology has the fastest developement and biggest potencial. Some say that its impact will be even more important than discovery of steam engine or penicillin. Out goal was to analyze the possibilities of dispergation of carbon nanotubes (CNT) in aquaeous solution and cementitious matrix. The basic properties of carbon nanotubes are extreme tensile strength and Young’s modulus of elasticity, high aspect ratio and huge specific surface area. Because of this, CNT tend to aggregation and cluster formation. When load is applied on the composite, those clusters behaves like filler with very poor mechanical properties, causing decrease of both tensile and compressive strenght. Perfect dispersion of CNT is essential to avoid this problem. Experimental part of this paper is aimed to dispersion of carbon nanotubes in aquaeous solution with use of proper surfactant to produce stable suspension. To achieve this, magnetic stirring and ultrasonication was used. The quality of dispersion was examined through ultraviolet and visible spectroscopy and scanning electron microscopy. Samples of cement mortar reinforced with carbon nanotubes were made and their tensile and compressive strength in the age of 7 and 28 days was tested.