Permeabilidade de sistemas compostos de resíduos de construção e demolição reciclados (RCD-R) e geotêxteis não tecidos
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2020-02-28
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Universidade Federal de Goiás
Resumo
Recycling can help reduce environmental impacts, provides high quality construction materials and
lower the cost of geotechnical works. Recently, studies have shown the feasibility of using these
materials as backfill material in geosynthetic reinforced soil (GRS) structures. In this scenario, most of
these studies focused on investigating the physical, mechanical and chemical properties of recycled
construction and demolition waste (RCDW). However, the hydraulic properties of these recycled
materials are also relevant information for the design of GRS structures, given that the filling material
must be able to allow the drainage of the reinforced soil. In this context, the main objective of this work
was to investigate the hydraulic properties of RCDW simulating field conditions (different levels of
normal stress), as well as their association with non-woven geotextiles (GTNW). Bearing in mind the
geotechnical approach, RCDW (gray sand and rubble dust) were tested following the standard
procedures usually performed on soils. Samples of RCDW (gray sand and rubble dust) were collected
in a recycling plant and a natural sand was used as a reference material. Constant head permeability
tests were carried out on RCDW and natural sand, associated or not with GTNW polyester (PET) with
different masses per unit area (200 and 300 g / m²), and under different normal stress levels (0, 50, 100
and 200 kPa) applied to the specimen top. Granulometric analysis was carried out on material exhumed
from the specimens in order to investigate any changes. Scanning electron microscopy (SEM) images
were also obtained in the exhumed GTNW to assess the occurrence of clogging. The geotechnical
characterization showed that RCDW presents characteristics similar to those of granular soils and with
low variability. It was observed that the application of normal stress to the specimens top reduced the
permeability of the RCDW and natural sand, when associated or not with the GTNW, once the applied
stress altered the voids of the materials and so hindered the flow of water. The permeability of RCDW
and natural sand also reduced when just associated with GTNW without the application of normal
stress. Laser granulometric analysis revealed different granulometry alterations in different points along
the specimen height and among the researched materials. The images by SEM did not show evidence
of the GTNW clogging. The results showed that RCDW presented physical, mechanical and hydraulic
properties similar to those of granular materials, which allow the application of these recycled materials
in several types of geotechnical works, with the advantage of being environmentally friendly filling
materials.
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Citação
BRITTO, A. F. S. Permeabilidade de sistemas compostos de resíduos de construção e demolição reciclados (RCD-R) e geotêxteis não tecidos. 2020. 128 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2020.