Effect of temperature and activator molar of Na۲O to SiO۲ in the process of synthesis and microstructure of cement geopolymer
Publish Year: 1392
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JMATPR-1-3_001
تاریخ نمایه سازی: 12 مهر 1400
Abstract:
Inorganic polymers were synthesized from dehydroxylated aluminosilicate clay (metakaolinite) condensed with sodium silicate in a highly alkaline environment. The thermal treatment of aluminosilicate materials causes changes in their structure with an increase in the amorphous phase. For that kind of structural change XRD analysis is not appropriate, so those changes are currently assessed by infrared emission spectra analysis (FTIR). The most characteristic FTIR band in the geopolymeric systems appears in the wavenumbers region ۹۹۰-۱۰۹۰cm-۱ and is attributed to the asymmetric stretching vibration of T-O-Si, where T denotes Si or Al. The shift of this peak towards lower wavenumbers indicates the dissolution of the amorphous aluminosilicate phase of the raw material and the formation of a new amorphous gel in which the backbone consists of polymeric chains with smaller length in relation to the ones of the raw material. The SEM result showed that geopolymer paste was formed from quartz remaining particles and gel. The remaining particle size was reduced by increase of the curing temperature and Na۲O/SiO۲ molar ratio. The results indicated that samples with adequate strength are created compact and crack-free areas.
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Authors
M Asadi
Ph.D. student, Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
A Nemati
Department of Materials Engineering, University of Sharif Technology, Tehran, Iran
R Naghizadeh
School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
K Arzani
Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
J Fahim
Ph.D. student, Department of Materials Engineering, Najafabad Branch, Islamic Azad University,Isfahan,Iran