Banca de DEFESA: NAYARA TAMIRES ALVES FRANCISCO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : NAYARA TAMIRES ALVES FRANCISCO
DATE: 29/02/2024
TIME: 08:30
LOCAL: Virtual
TITLE:

OBTAINING GEOPOLYMER CEMENTS WITH ACID ACTIVATION FORMULATED FROM MINING WASTE AND GRAPHENE

KEY WORDS:

Geopolymer cements; mining waste; acid activation (phosphoric acid); silicoaluminophosphate; graphene.

PAGES: 95
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Materiais Conjugados Não-Metálicos
SUMMARY:

Currently, geopolymeric pastes are obtained from acid or alkaline activation in mixtures with natural raw materials or waste, rich in silica (SiO2) and alumina (Al2O3).In general, these inorganic polymers present reasonable mechanical performance, thermal and tribochemical resistance.Mining waste (powder) from dams rich in aluminosilicates can be reused to obtain geopolymer cements using the two-part or one-part method.The State of the Art is the synthesis of geopolymer compounds called silicoaluminophosphates by activation with phosphoric acid in the form of an aqueous solution.This research work aims to evaluate the potential of using slate mining waste as a raw material for the synthesis of geopolymeric materials.Different formulations were made, varying the levels of residue and acid and alkaline activator, in percentages of 1%, 0.25% and 0.5% of graphene.With an increase in compressive strength 41% alkaline base and 62% acid base.The mechanical behavior was analyzed through compression tests at 28 days.The materials then underwent FRX, XRD, laser granulometric analysis, scanning electron microscopy (SEM) characterizations of both the raw material and the geopolymeric fragments.Mechanical resistance values were satisfactorily achieved for non-structural masonry, the studied residue can be applied as mortar in auxiliary structures using the geopolymerization technique and graphene can be used to promote increases in the mechanical resistance of the material produced.

COMMITTEE MEMBERS:
Presidente - SIDNEY NICODEMOS DA SILVA
Interno - JOAO PAULO FERREIRA SANTOS
Externo ao Programa - MATEUS JUSTINO DA SILVA