Adição de Nanotubos de Carbono de Paredes Múltiplas em Argamassas de Revestimento.

Abstract

Currently nanotechnology has provided significant technological innovations in various fields of science and engineering. A material that has been outstanding in these areas is the carbon nanotube. Carbon nanotubes are cylinders composed of carbon structures, which may be present in a single layer, called carbon nanotubes simple walls (SWNT), or multiple overlapping layers, which are multi-walled (MWNT) carbon nanotubes. In this context, the aim of this study was to analyze the behavior of a mortar coating produced with multi-walls carbon nanotubes, added in the amount of 0.3% in the mass of cement, and compare its performance with a mortar industrialized, both applied in the same working conditions. For the present study it was necessary to functionalize and disperse the MWNT. For functionalization sulfuric acid (H2SO4) and nitric (HNO3) 1 . Functionalized MWNT were neutralized with ammonium hydroxide (NH3). Tests of mechanical and physical characterization were performed on fresh and hardened state2 . For the identification of the interface formed between the tested mortars and their substrates, analysis were made of the formed microstructure and elemental chemical composition were made by scanning electron microscopy. The results showed that the mortar with MWNT performed better than the industrialized mortar, with respect to density, consistency, workability, tensile strength and resistance to axial compression. This Indicates that improvements were caused by the presence of MWNT.