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Previous issue date: 2013-11-29 / The sharp consumption of natural resources by the construction industry has motivated
numerous studies concerning the application of waste to replace partially or fully, some
materials, such as aggregates, thereby reducing the environmental impact caused by the
extraction of sand and crushing process. The application of stone dust from crushing
process arising as an aggregate for the production of Portland cement concrete is a viable
alternative in view of the high cost of natural sands, in addition to the environmental
damage which causes its operation to the environment. The stone dust has reduced cost
compared to natural sand because it is produced in the beds of their own quarries, which
are usually located close to major urban centers. This study examined the feasibility of
using stone dust from the crushing of rock gneisses in the state of Bahia, replacing natural
quartz sand. In the development of scientific study was conducted to characterize physical
and chemical raw materials applied and molded cylindrical specimens , using as reference
values Fck 20, Fck 25 and Fck 30 MPa ( resistance characteristic of the concrete after 28
days) in following compositions stone powder: 10%, 30%, 50 %, 100% and 100% with
additive. The specimens were cured and subjected to the tests of compressive strength and
water absorption, then the samples were subjected to the tests of X-ray diffraction and
scanning electron microscopy. The results obtained showed that the composition with
10% stone powder showed the best results regarding the physical and mechanical tests
performed, confirming the reduction in compressive strength and increased water uptake
increased as the content of the powder stone in the concrete composition / O acentuado consumo de recursos naturais pela ind?stria da constru??o civil tem
motivado in?meros estudos referentes ? aplica??o de res?duos que substituam
parcialmente ou totalmente alguns materiais, como os agregados, reduzindo assim o
impacto ambiental causado pela extra??o da areia e pelo processo de britagem. A
aplica??o do p? de pedra oriundo do processo de britagem como agregado para a
produ??o de concretos de cimento Portland, ? uma alternativa vi?vel, tendo em vista o
alto custo das areias naturais, al?m dos danos ambientais que sua explora??o ocasiona ao
meio ambiente. O p? de pedra possui custo reduzido comparado ao da areia natural pelo
fato de ser produzido nos canteiros das pr?prias pedreiras, que geralmente ficam
localizadas pr?ximas aos grandes centros urbanos. A presente pesquisa analisou a
viabilidade da utiliza??o do p? de pedra proveniente da britagem de rochas gnaisses no
estado da Bahia, em substitui??o ? areia natural quartzosa. No desenvolvimento deste
estudo cient?fico foi realizada a caracteriza??o f?sica e qu?mica das mat?rias-primas
aplicadas e moldados corpos de prova cil?ndricos, utilizando-se como refer?ncia os
valores de Fck 20, Fck 25 e Fck 30 MPa (Resist?ncia caracter?stica do concreto aos 28
dias) nas seguintes composi??es de p? de pedra:10%, 30%, 50%, 100% e 100% com
aditivo. Os corpos de prova foram curados e submetidos aos ensaios de resist?ncia ?
compress?o e absor??o de ?gua, em seguida as amostras foram submetidas ? ensaios de
difra??o de raios X e microscopia eletr?nica de varredura. A an?lise dos resultados
obtidos constatou que a composi??o com 10% de p? de pedra apresentou os melhores
resultados referentes aos ensaios f?sicos e mec?nicos realizados, confirmando a redu??o
da resist?ncia ? compress?o e o aumento da absor??o de ?gua ? medida que se aumentou
o teor do p? de pedra na composi??o do concreto
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12819 |
| Date | 29 November 2013 |
| Creators | Duarte, Jo?o Batista |
| Contributors | CPF:50580396720, http://lattes.cnpq.br/5460040602567184, Silva, Jaquel?gia Brito da, CPF:02585622428, http://lattes.cnpq.br/5948828937239319, Silva, Vamberto Monteiro da, CPF:67456863415, Acchar, Wilson |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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