Comparison of using NaOH and KOH activated fly ash-based geopolymer on the mechanical properties

Geopolymer synthesis has two main requirements to fulfil which are the source material that is rich in Silicon (Si) and Aluminum (Al) and alkali activator such as sodium/potassium hydroxide. Sodium hydroxide (NaOH) is widely used for the synthesis of geopolymer compared to potassium hydroxide (KOH)...

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Main Authors: Abdul Rahim, R.H., Rahmiati, T., Azizli, K.A., Man, Z., Nuruddin, M.F., Ismail, L.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.26308 /
Published: Trans Tech Publications Ltd 2015
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907001009&doi=10.4028%2fwww.scientific.net%2fMSF.803.179&partnerID=40&md5=207893678f1056612cdd374ffc812d01
http://eprints.utp.edu.my/26308/
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spelling utp-eprints.263082021-08-30T07:06:59Z Comparison of using NaOH and KOH activated fly ash-based geopolymer on the mechanical properties Abdul Rahim, R.H. Rahmiati, T. Azizli, K.A. Man, Z. Nuruddin, M.F. Ismail, L. Geopolymer synthesis has two main requirements to fulfil which are the source material that is rich in Silicon (Si) and Aluminum (Al) and alkali activator such as sodium/potassium hydroxide. Sodium hydroxide (NaOH) is widely used for the synthesis of geopolymer compared to potassium hydroxide (KOH) with addition of silicate solution for the purpose of increasing dissolution process. However, the comparison of using different activator in the absence of silicate solution for geopolymer synthesis is not well established. This paper presents an evaluation on compressive strength of fly ash-based geopolymer by using different activator (KOH and NaOH) with respect to different curing conditions (time and temperature) in the absence of sodium silicate. The samples were mixed using mortar mixer and prepared in 50mm � 50mm � 50mm mould for determination of compressive strength. It can be observed that the highest compressive strength up 65. 28 MPa was obtained using NaOH. Meanwhile, synthesis using KOH only recorded 28. 73 MPa. The compressive strength was better when cured at elevated temperature (60°C) than room temperature (25°C). Further analysis on the microstructure of the highest compressive strength geopolymer samples for both activators was carried out using Field Emission Scanning Microscopy (FESEM) and Raman spectroscopy. © (2015) Trans Tech Publications, Switzerland. Trans Tech Publications Ltd 2015 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907001009&doi=10.4028%2fwww.scientific.net%2fMSF.803.179&partnerID=40&md5=207893678f1056612cdd374ffc812d01 Abdul Rahim, R.H. and Rahmiati, T. and Azizli, K.A. and Man, Z. and Nuruddin, M.F. and Ismail, L. (2015) Comparison of using NaOH and KOH activated fly ash-based geopolymer on the mechanical properties. Materials Science Forum, 803 . pp. 179-184. http://eprints.utp.edu.my/26308/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description Geopolymer synthesis has two main requirements to fulfil which are the source material that is rich in Silicon (Si) and Aluminum (Al) and alkali activator such as sodium/potassium hydroxide. Sodium hydroxide (NaOH) is widely used for the synthesis of geopolymer compared to potassium hydroxide (KOH) with addition of silicate solution for the purpose of increasing dissolution process. However, the comparison of using different activator in the absence of silicate solution for geopolymer synthesis is not well established. This paper presents an evaluation on compressive strength of fly ash-based geopolymer by using different activator (KOH and NaOH) with respect to different curing conditions (time and temperature) in the absence of sodium silicate. The samples were mixed using mortar mixer and prepared in 50mm � 50mm � 50mm mould for determination of compressive strength. It can be observed that the highest compressive strength up 65. 28 MPa was obtained using NaOH. Meanwhile, synthesis using KOH only recorded 28. 73 MPa. The compressive strength was better when cured at elevated temperature (60°C) than room temperature (25°C). Further analysis on the microstructure of the highest compressive strength geopolymer samples for both activators was carried out using Field Emission Scanning Microscopy (FESEM) and Raman spectroscopy. © (2015) Trans Tech Publications, Switzerland.
format Article
author Abdul Rahim, R.H.
Rahmiati, T.
Azizli, K.A.
Man, Z.
Nuruddin, M.F.
Ismail, L.
spellingShingle Abdul Rahim, R.H.
Rahmiati, T.
Azizli, K.A.
Man, Z.
Nuruddin, M.F.
Ismail, L.
Comparison of using NaOH and KOH activated fly ash-based geopolymer on the mechanical properties
author_sort Abdul Rahim, R.H.
title Comparison of using NaOH and KOH activated fly ash-based geopolymer on the mechanical properties
title_short Comparison of using NaOH and KOH activated fly ash-based geopolymer on the mechanical properties
title_full Comparison of using NaOH and KOH activated fly ash-based geopolymer on the mechanical properties
title_fullStr Comparison of using NaOH and KOH activated fly ash-based geopolymer on the mechanical properties
title_full_unstemmed Comparison of using NaOH and KOH activated fly ash-based geopolymer on the mechanical properties
title_sort comparison of using naoh and koh activated fly ash-based geopolymer on the mechanical properties
publisher Trans Tech Publications Ltd
publishDate 2015
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907001009&doi=10.4028%2fwww.scientific.net%2fMSF.803.179&partnerID=40&md5=207893678f1056612cdd374ffc812d01
http://eprints.utp.edu.my/26308/
_version_ 1741197117469229056
score 11.62408

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