Synthetic Aluminosilicates for Geopolymer Production

The use of geopolymer has been studied as a potential substitute for Portland cement due to lower CO2 emission and improvements on structural properties. Some of the major raw materials used in the manufacture of the geopolymer are: steel slag, fly ash and metakaolinite. Due to the impurities contai...

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Bibliographic Details
Published inMaterials research (São Carlos, São Paulo, Brazil) Vol. 22; no. 2; p. 1
Main Authors Pereira, Mariana Arruda, Vasconcelos, Daniela C. Leite, Vasconcelos, Wander Luiz
Format Journal Article
LanguageEnglish
Published Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 2019
ABM, ABC, ABPol
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects
Aluminosilicates
Aluminum silicates
ENGINEERING, CHEMICAL
Fly ash
Fourier transforms
geopolymer
Geopolymers
MATERIALS SCIENCE, MULTIDISCIPLINARY
metakaolinite
METALLURGY & METALLURGICAL ENGINEERING
NMR
Nuclear magnetic resonance
Portland cements
Raw materials
Scanning electron microscopy
sol-gel process
Sol-gel processes
Synthetic aluminosilicates
X-ray diffraction
geopolymer
Synthetic aluminosilicates
sol-gel process
metakaolinite
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Summary:The use of geopolymer has been studied as a potential substitute for Portland cement due to lower CO2 emission and improvements on structural properties. Some of the major raw materials used in the manufacture of the geopolymer are: steel slag, fly ash and metakaolinite. Due to the impurities contained in these raw materials, the present study uses high purity synthetic aluminosilicates made from the sol gel process for production of geopolymers. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR). The results showed that the synthetic aluminosilicates have similar behavior to metakaolinite (reference). It was found that the coordination of Al in the synthetic aluminosilicate changed from VI to IV and V from 300 °C, with the highest intensity at 900 °C. Temperature at which the highest mechanical strength of the geopolymer was also observed.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2018-0508