Banca de DEFESA: IGOR VIEIRA FERNANDES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : IGOR VIEIRA FERNANDES
DATE: 21/03/2023
TIME: 14:00
LOCAL: Programa de Pós-Graduação em Engenharia Civil
TITLE:

Evaluation of the Pozolanicity of the Sludge Coming From the Textile Industry Effluent Treatment Station for Use as a Supplementary Cementitious Material

KEY WORDS:

textile sludge; sludge ashes; pozzolanicity; supplementary cementitious material; sustainability

PAGES: 133
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The environmental impact caused by the Local Productive Arrangement (APL) of the Confection of the State of Pernambuco in the generation of solid waste is the main problem that motivated this study. Most laundries located in the APL do not correctly dispose of the waste generated, with textile sludge (LOTex) commonly dumped in landfills without any kind of treatment. This research aims to evaluate the pozzolanicity of LOTex for its use in the partial replacement of cement. This possible solution could contribute to reducing the storage of this waste and, consequently, reducing carbon dioxide emissions resulting from the manufacturing process of Portland cement. The sludge was collected at the APL in Pernambuco and submitted to processing through grinding and calcination. A part of the collected ma- terial was not submitted to calcination, being denominated as in nature , and another part was calcined at temperatures of 600, 700, and 800oC. For analysis of the specific area, the in nature and calcined samples were subjected to milling and classified according to the fineness range: unmilled, 600, 900, and 1200 m2/kg. According to the results of the pozzolanic activity index with hydrated lime (NBR 5751), only the samples calcined at 600oC with Blaine finenesses of 900 m2/kg and 1200 m2/kg obtained com- pressive strength above 6 MPa, which can be considered as a material with pozzolanic potential. In the pozzolanic activity index test with Portland cement (NBR 5752), all calcined samples with Blaine fine- nesses of 900 m2/kg and 1200 m2/kg demonstrated pozzolanic potential by obtaining indices above 90% of the reference strength obtained only with Portland cement. In both pozzolanicity indexes, it was observed that this property was favored with the calcination and with the increase of the specific surface of the samples. Corroborating the results obtained in the indices, the X-ray diffraction (DRX) and ther- mogravimetry (TG) tests confirm the increase in calcium hydroxide (CH) consumption, which charac- terizes a pozzolanic reaction. In the analysis of the intensity of its characteristic peaks (18° and 24°2Ɵ) in the XRD test, the results demonstrate the increase in calcium hydroxide (CH) consumption through the decrease in the intensity of its characteristic peaks and the formation of compounds hydrated. In the TG, analogous to the results of the XRD, the consumption of CH was observed through the reduc- tion of the peak in the range of 400 to 600oC. According to XRD and TG results, the best performance was obtained in samples calcined at 600oC. The correlation between the direct methods (NBR 5751 and NBR 5752) was less evident than the direct methods, possibly due to the filler effect observed in NBR 5752. The correlation between the direct methods (XRD and TG) was evident since both are direct measures of calcium hydroxide consumption. Within the limitations of this research, it demonstrates the viability of LOTex as an alternative material to be used as an addition to Portland cement with proper heat treatment and adequate grinding.

COMMITTEE MEMBERS:
Externo à Instituição - MAURO MITSUUCHI TASHIMA - UNESP
Externa à Instituição - ANA MARIA GONÇALVES DUARTE MENDONÇA - UFCG
Externa à Instituição - ALINE FIGUEIREDO NÓBREGA DE AZEREDO - UFCG
Presidente - 1670637 - ANTONIO ACACIO DE MELO NETO