SILVA, P. V.; http://lattes.cnpq.br/5236186784633752; SILVA, Patrícia Venâncio da.
Resumen:
In the search for alternatives that aim to reduce production energy and environmental impacts,
research has again given emphasis to vegetable fibers in composites, as they are materials
considered less expensive and of renewable origin, when compared to synthetic fibers. The
progress of research and development of new technologies, in this sense, are necessary to obtain
a material that meets the requirements of the market, functionality and environmental issues.
The analysis becomes more complex when considering the relationship between the fiber and
the matrix due to the large number of factors that interfere in this interaction between the matrix,
fiber, processing form and interface. Based on the above, it was decided to use caroá
(Neoglaziovia variegata) and sisal (Agave sisalana) fibers, which are species widespread in the
Northeast Region, generating direct and indirect jobs in their production chains. Thus, the
objective of this work was to analyze the development of a cementitious composite reinforced
with a 1% content of vegetable fibers treated with pyroligneous liquor, aiming at the structural
reinforcement and a greater longevity of the composite and the fiber-matrix interaction. The
composites were mechanically characterized by means of three-point bending tests, tensile tests
by uniaxial compression and physically by means of the water absorption test, in addition to
thermal, XRD and morphological analyses. The fibers were characterized using physical and
mechanical tests. The microscopy results indicate that the treatment provided greater cleaning
on the surface of the fiber, reducing the hydrophilicity and preserving the integrity of the fiber
in the composite. On the other hand, the mechanical tests indicated that for the three-point
bending test there was a reduction in the strength of the treated sisal fibers while the caroá fibers
showed an increase in strength, while for the axial compression test the untreated fibers
obtained better results. In the thermal characterization the untreated fibers obtained better
results for the thermal conductivity. In the XRD, the fibers impregnated with pyroligneous
liquor obtained a higher crystallinity index.