Efeito da celulose nanofibrilada no estado fresco de pastas cimentícias

Abstract

When observing the current engineering scenario, it is opportune, with the increase in the volume of constructions, the use of intelligent cementitious matrix compounds. According to research, incorporating nanotechnology in cementitious matrix composites can change its microstructure, providing more efficient and durable materials. In these respects, cellulose-based nanomaterials have emerged as a promising option to modify the properties of cement-based products in their fresh state. The present work aimed to evaluate the rheological behavior of cementitious pastes produced with different nanofibrillated cellulose pulp (CNF) contents. Through the results obtained by the consistency index test, it cannot be stated that the addition of pulp affected the spreading of the pastes. Through the statistical analysis, it cannot be stated that the NFC pulp acted as an air entrainer in the cementitious materials, reducing its density, since the variations were not very significant. The squeeze-flow test shows that the CNF Pulp acted as a lubricant in cementitious materials, reducing the friction between the particles and improving the spreadability of the pastes.