Banca de DEFESA: BRUNA SOUZA ROSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : BRUNA SOUZA ROSA
DATE: 08/02/2024
TIME: 09:00
LOCAL: Sala virtual do PEC
TITLE:

EVALUATION OF POTENTIALLY TOXIC COMPOUNDS IN ANHYDRO CEMENT: PROPOSAL FOR A QUANTITATIVE METHOD BY LEACHING TESTS

KEY WORDS:

Heavy metals, Leaching, Coprocessing.

PAGES: 195
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

Safe, effective and economically viable solutions are essential given the importance of
reducing the environmental impact of cement production. The use of waste co-
processing as an alternative fuel and as a raw material in the synthesis of Portland
cement clinker has been used to reduce the demand for fossil fuels and natural raw
materials in cement production. However, the incineration of these materials can result
in increased levels of potentially toxic compounds (PTCs) in the kiln system, including
highly volatile heavy metals such as lead, cadmium and others, which are of great
environmental concern. One of the gaps in the study of these CPTs is their
quantification in anhydrous cement. The aim of this research is to propose a method
for quantifying potentially toxic compounds in anhydrous cement by means of leaching
tests. To this end, analytical techniques were applied to characterize samples of
commercial Portland cement and cements produced in the laboratory. Calorimetry
tests were then carried out with different solutions to assess the stages of cement
hydration during the handling of the leaching test. After defining the solution, leaching
tests were carried out. Finally, a specific method for quantifying CPTs for anhydrous
cements was proposed. The results obtained through calorimetric analysis indicated
that, although the same leaching solution was used for all the cements tested,
variations were observed in the setting times associated with each type of cement. The
proposed method was able to analyze 11 metals. By contrasting the quantification
results obtained according to the NBR 10005 and TCLP 1311 guidelines with the
results generated by the method used in this study, improved quantitative precision
was observed after the methodological procedure was refined.

COMMITTEE MEMBERS:
Interno - 2652701 - JARDEL PEREIRA GONCALVES
Externa ao Programa - 1677204 - ELAINE CHRISTINE DE MAGALHAES CABRAL ALBUQUERQUE - UFBAExterna à Instituição - ANA PAULA KIRCHHEIM - UFRGS