Banca de DEFESA: VICTOR ALVES SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : VICTOR ALVES SANTOS
DATE: 11/07/2024
TIME: 09:00
LOCAL: meet.google.com/okw-cdia-yvy
TITLE:

Inertization of textile sludge in concrete for use in interlocking pavement

KEY WORDS:

Textile sludge; addition; concrete; interlocking flooring; inertization.

PAGES: 92
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

Textile sludge, also known as dye sludge or textile residue, refers to the solid waste generated during the fabric dyeing process in the textile industry. These residues may include chemicals, dyes, solvents, fabric fibers, and other impurities that are washed or filtered out during the dyeing process. This waste can negatively impact the environment in various ways, including water and soil contamination, which can affect human health. Additionally, some sludge treatment processes can emit toxic gases, contributing to air pollution. This environmental pollution highlights the importance of sustainable waste management practices in the textile industry to mitigate these adverse impacts. The study in question aims to achieve environmentally sound disposal of textile sludge by analyzing the feasibility of inertizing the residue in concrete for use in interlocking pavements, adding 6%, 8%, and 10% relative to the natural fine aggregate used (washed sand). For concrete dosing, the method developed by the Brazilian Portland Cement Association (ABCP) was used, defining a mix ratio of 1:1.19:2.18:0.40 (cement, sand, gravel, and water, respectively), from which concrete prism blocks were molded with and without the addition of textile waste. After a curing period of 28 days, axial compression strength tests and water absorption tests were conducted to evaluate whether the molded blocks with added sludge meet the compression strength and water absorption parameters established by NBR 9781/2013, which are a minimum strength of 35 MPa and a maximum acceptable water absorption of 6% for concrete paving blocks. To obtain a more comprehensive understanding of the physical and chemical compositions of textile sludge, characterization tests were conducted, including moisture content, specific gravity, particle size distribution, organic matter content, chemical composition analysis using X-ray fluorescence (XRF), and evaluation of the residue's behavior under temperature variations through thermal analysis (TG/DTG). The molded blocks showed a gradual decrease in axial compression strength as the percentages of added sludge increased in the concrete, while still maintaining the desired strength of 35 MPa in all percentages of added sludge. The water absorption of the molded blocks increased directly proportional to the amount of textile sludge added in each dosage but remained below 6%. The average moisture content of the textile sludge was 67.7%, the organic matter content was 4.6%, the fineness modulus was 2.95, and the maximum particle size was 4.75 mm. Regarding the chemical composition, the presence of calcium oxide (CaO), silicon dioxide (SiO2), and aluminum oxide (Al2O3) stands out. The specific gravity of the sludge was 1.85 g/cm³, being 26.67% lighter than the fine aggregate used in the study. The concrete blocks molded with the addition of sludge proved to be an environmentally sound disposal strategy for the residue, while also increasing the production volume by 14.29% in the mixtures molded with 8% and 10% added textile sludge.

COMMITTEE MEMBERS:
Externo à Instituição - WALKER GOMES DE ALBUQUERQUE
Interno - ALEX SOUZA MORAES
Presidente - ROMILDO MORANT DE HOLANDA