| dc.description.abstract | Polyester is the fiber with the highest production in the world and greatest
potential for generating waste. The fabric scraps are liable to be recycled, becoming a
raw material for other industries. In this research, the objective is to evaluate the use
of polyester clothing waste as reinforcement in cementitious composites without
structural function. For this, low specific mass traits were developed with the use of
light vermiculite aggregate. In order to avoid a fast degradation of the textiles, partial
replacement of the cement (25%) by fly ash (FA) was used and the waste was treated
by impregnation with styrene butadiene polymer (SBP) and silica fume (SF). Physical
and chemical characterization of the materials was carried out; screaning and treating
waste for conversion to reinforcement, and its characterization; characterization of the
cementitious matrix in the fresh and hardened state; evaluation of the mechanical
properties and microstructure of composites without reinforcement, reinforced with
untreated clothing waste, treated by impregnation with SBP and SBP + SF. The fabrics
without impregnation and impregnated with SBP showed, respectively, 22.69% and
13.48% more satisfactory performance in the warp direction, whereas those
impregnated with SBP + SF obtained equivalent values in both directions of the fabric.
The high particle size of the FA, the resistance to axial compression of the lower
cement matrix in the specimens with FA and the low consumption of CH verified in the
TG/DTG test in the FA paste, indicate the low reactivity of the pozzolana. In the
specimens without FA, there was an increase in the resistance to direct traction of
53.57% and 64.28%, as well as 92.10% and 94.73% in the tensile strength of the
composites with reinforcement impregnated with SBP and SBP + SF, respectively, in
relation to those without reinforcement. In addition, in the direct traction test, the greater
number of cracks in the specimens in which the reinforcement received SBP in relation
to the one without impregnation, indicate the benefit of the treatment. The plates with
greater tenacity in the impact test were those with fabric impregnated with SBP + SF.
Based on this study, since FA was used without processing, no benefits were
observed. In turn, the reinforcements contributed to the performance of the composite
in terms of the properties evaluated, especially when the reinforcement received
treatment by impregnation. | en |
