Banca de DEFESA: NATHALY SANTANA LEAL DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : NATHALY SANTANA LEAL DE SOUZA
DATA : 28/03/2019
HORA: 09:00
LOCAL: Auditório do CTEC
TÍTULO:

Lightweight aggregate development from local raw materials and wastes
(Northeast/Brazil).


PALAVRAS-CHAVES:

Artificial lightweight aggregate, sintering waste, sugar cane bagasse ash (SCBA),
cutting ornamental rock waste (COR), scanning electron microscopy (SEM).


PÁGINAS: 148
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Construção Civil
RESUMO:

Lightweight aggregates can be classified as natural, eg pumice and volcanic tuff, and
artificial aggregates produced from clay, vermiculite, slag and industrial wastes. They
are granular materials with porous structure used in several applications as thermal-
acoustic insulation and in lightweight concretes, for example. The most traditional
lightweight aggregate is expanded clay, manufactured in Brazil since 1968, in the State
of São Paulo, whose production is currently concentrated in the Brazilian Southeast.
The hypothesis that the scientific deepening in the development of lightweight
aggregates using local waste (Rio Grande do Norte/Northeast/Brazil) may increase the

use of lightweight aggregates, especially in lightweight structural concrete, in Brazilian
Northeast. In this context, the study aimed to develop innovative lightweight
aggregates, from industrial and agroindustrial wastes and regional clays
(Northeast/Brazil), which are: the sugar cane biomass waste (SCBW), with different
types of processing; granite and marble cutting waste (GMCW) and different clays. The
precursors were characterized by surface area (BET), laser grain size, fineness, specific
and unit mass, as well as thermal (DTA/TG), chemical (XRF) and mineralogical (XRD)
analyzes. The studied mixtures had a residue content varying from 0% to 100%, and
were submitted to sintering at temperatures of 1000°C to 1263°C in a muffle furnace.
The aggregates produced were analyzed by the analysis of several properties: drying
shrinkage index, visual analysis, particle density, water absorption, bulk density,
modulus of deformation of the light aggregates, swelling index, weight loss, tensile
strength and morphology (SEM). There were several aggregates with an particle density
(PD) of less than 2,00g/cm³, a water absorption (WA) of less than 15% and a bulk
density (BD) of less than 0,88g/cm³, produced with both residues, in especially those
produced with SCBW, agroindustrial waste in contents higher than 50%, presenting PD
of 1,39 g/cm³ and WA of 3%. On the other hand, the compositions with GMCW
generated lightweight aggregates with PD of 1,56 g/cm³, WA of 8% and BD of 0,85
g/cm³, in addition to having tensile strength 4 times higher than the lightweight
aggregate marketed in Brazil. In conclusion, local industrial and agroindustrial wastes,
associated with local clays, have the potential to produce innovative lightweight
aggregates with excellent technical characteristics, as well as using wastes in the
composition, making feasible a noblest destination.


MEMBROS DA BANCA:
Externa à Instituição - ANA CECILIA VIEIRA DA NOBREGA - UFPE
Interna - 1717461 - LUCIANA DE FIGUEIREDO LOPES LUCENA
Presidente - 022.621.844-96 - MARCOS ALYSSANDRO SOARES DOS ANJOS - IFRN
Externa ao Programa - 1507841 - MARIA DAS VITORIAS VIEIRA ALMEIDA DE SA
Notícia cadastrada em: 15/03/2019 15:45
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