Banca de DEFESA: SUZY AUCÊNIA DE OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : SUZY AUCÊNIA DE OLIVEIRA
DATA : 07/08/2026
HORA: 14:00
LOCAL: Bloco da Engenharia Florestal
TÍTULO:

ADOBE COM ADIÇÃO DA FIBRA DE SISAL (Agave sisalana): UMA ALTERNATIVA PARA CONSTRUÇÕES SUSTENTÁVEIS

PALAVRAS-CHAVES:

Environmental impacts. Adobe. Sisal fiber. Physical-mechanical properties.
Sustainability.

PÁGINAS: 75
RESUMO:

The construction industry is one of the main generators of solid waste and greenhouse gas
emissions worldwide. In this context, this study presents construction solutions that encourage
the efficient use of available resources, especially in the Brazilian Semi-Arid region, promoting
local development and reducing environmental impacts. As a sustainable material alternative
with low environmental impact that does not require firing processes, thus reducing high energy
consumption in its production, adobe stands out. This technique was widely used in the
Brazilian semi-arid region for housing construction in the first half of the 20th century. Studies
indicate that the incorporation of natural fibers can improve the physical and mechanical
properties of these blocks, as well as increase strength and control cracking. Sisal fiber (Agave
sisalana) emerges as a natural fiber option that can be easily found, especially in the Northeast
region, which is considered the largest sisal-producing area in Brazil. The adobe was produced
mainly using soil with the addition of sisal fiber in different proportions (0.00%, 0.25%, 0.50%,
0.75%, and 1%). The experimental design was divided into three stages: in the first stage, the
characterization of the soil and fiber was carried out through physical and mechanical tests. In
the second stage, treatments were defined based on soil composition and fiber content, and the
adobe blocks were produced. After the curing process of the adobe blocks (28 days outdoors),
the third and final stage consisted of physical and mechanical testing of the specimens. In
addition, visual characterization was performed using scanning electron microscopy (SEM).
Regarding soil characterization, the particle size distribution showed 47.95% sand, 33.84% silt,
and 18.21% clay, classifying it as a low-plasticity loam soil, with a liquid limit of 26.79%,
plastic limit of 20.25%, and plasticity index of 6.54%. The particle density was 3.16 g/cm³.
Fiber characterization showed a density of 1.37 g/cm³, moisture content of 8.72%, water
absorption of 211.17%, and tensile strength of 728.48 MPa. The results of the adobe tests
showed densities ranging from 1.70 to 1.79 g/cm³ and low moisture contents after drying,
between 3.03% and 3.59%. Regarding mechanical performance, all treatments analyzed
presented strengths ranging from 1.50 MPa to 2.52 MPa, meeting the requirements of ABNT
NBR 16814/2020. Adobe emerges as a sustainable and biodegradable material option that can
be reused without loss of performance.

MEMBROS DA BANCA:
Presidente - 1789417 - RAFAEL RODOLFO DE MELO
Externa ao Programa - 1565016 - LEONETE CRISTINA DE ARAUJO FERREIRA MEDEIROS SILVA - y UFERSAExterno à Instituição - EDGLEY ALVES DE OLIVEIRA PAULA - UFERSA
Externo à Instituição - FELIPE BENTO DE ALBUQUERQUE - IFRN