Per: Ana Luiza Campinho Paes (uenf), Jonas Alexandre (uenf), Larissa Campos Granato Botelho (uenf), Andreia Arenari Siqueira (uenf), Thuany Espirito Santo de Lima (uenf), Valber Domingos Pinheiro (uenf), Afonso Rangel Garcez de Azevedo (uenf)
Abstract:
Mortars for covering walls are widely used materials at constructions. To fulfill its function, the main desired properties are substrate adhesion and workability. To reduce cost and time of execution, the projection method can be employed, consisting in the mechanized sprayed of mortar on the substrate. In order to reduce cost even more, some enterprises opt to replace completely the lime, material with high commercial value. It is taken as reference a construction company of Campos dos Goytacazes’s region, which employs the projection system with phyllite, however, after the coating has dried, it presents cracking problems. This article’s aim was to find alternatives proposing a new trace using phyllite. Were performed tests at fresh and hardened state. Due to the absence of specific standards for the projected mortars, they were made according to the existing NBRs, and compared with conventional mortar. The results showed that the projected material had a better executive efficiency, however, when the phyllite was incorporated, the resistances and water retention decreased, while incorporated air content increased. As for the fissures, only decreasing the a/c ratio, it was possible to decrease their presence, which indicates that they are caused by drying shrinkage.