Banca de DEFESA: THAÍS MOTA FREITAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : THAÍS MOTA FREITAS
DATE: 12/08/2022
TIME: 14:00
LOCAL: DCTM - Link https://meet.google.com/xtr-nqii-yos
TITLE:

Long-term behavior of coir fibers reinforced soils

KEY WORDS:

Natural Aging; Reinforced soils; Coconut fibers

PAGES: 95
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Geotécnica
SPECIALTY: Mecânicas dos Solos
SUMMARY:

Soil reinforcement has been presented as an effective alternative to enable several
applications of these materials in view of their geotechnical characteristics, often limited
in the natural state. The addition of fibers to the soil is a reinforcement technique that
has a recognized effect of improving its mechanical properties. On the other hand, the
use of natural fibers is still the subject of several studies, since they degrade over time.
In view of this, the present work aims to evaluate the application of coconut fibers as
a reinforcement of a sandy-silty soil extracted from the area of boot outside the Aterro
Sanitário Metropolitano Centro de Salvador-Ba, after the natural aging process. The
experimental program consisted of the treatment of coconut fibers by the processes of
hornification, mercerization (treatment with NaOH) and the joint treatment (hornifi-
cation + NaOH). The pure soil and the composites containing 1% of untreated and
treated fibers were compacted in wooden boxes, which were exposed to the elements
for a period of five months. At the end of this period, the specimens were carveds
and triaxial tests CD were carried out at confining stresses of 50, 100 and 200 kPa and
tensile strength tests by diametral compression. The results obtained were compared
to analyzes without aging performed by Reis (2022). This comparison showed that the
strength of unreinforced soil and composites was subtly affected by aging. It was noticed
that the fibers treated with hornification promoted greater gains in the deviator stress of
the composites to those of the untreated fibers in the short and long term. On the other
hand, treatments with NaOH and hornification + NaOH caused a decrease in strength
when compared to untreated fibers. However, it was observed that even after the aging
process, the fibers continued to contribute to the shear strength.

BANKING MEMBERS:
Interna - 1299309 - MIRIAM DE FATIMA CARVALHO MACHADO
Interno - 1219972 - SANDRO LEMOS MACHADO
Externa à Instituição - MARIANA VELA SILVEIRA - UFC