Análise de propriedades do estado fresco em compósitos com LC3-55 para impressão 3D

Abstract

Civil construction is in constant evolution, seeking more and more to develop techniques and materials that optimize the activities carried out in this sector. However, in recent years, concern for the environment has become equally important, so that the creation of new technologies is being directed towards sustainability. The present work aims to develop traces of mortars for 3D printing, using a cement known as LC3, which contains 30% limestone filter, 45% calcined clay and the other 55% Portland cement. Composites will be produced that use a lower concentration of clinker to replace less polluting materials. Thus, through tests on mortars in the fresh state, the influence of the variation in the water/cement ratio and the percentage of a superplasticizer additive on parameters such as fluidity, consistency, workability and extrusion capacity, which are essential to evaluate the use of composites designed for 3D printing. In this way, it was possible to verify that the increase in the superplasticizer additive contributed to the thixotropy of the mortar, an important property for composites that will be extruded. In addition, with the decrease in the w/c ratio, the analyzed mixes presented axial resistances that reached up to 72 MPa, promising values for the study of composites produced with LC3.