Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar

Adoption of coal fly ash (Class C) as the main source material for geopolymers would cause rapid setting to the fresh geopolymer mortar or concrete. This behaviour explained the limited application of this material in the construction industry. On the other hand, calcium nitrate (Ca(NO3)2) and dipo...

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Main Authors:	Norbaizurah, Rahman, Amalina Hanani, Ismail, Kusbiantoro, Andri
Format:	Article
Language:	English
Published:	Trans Tech Publications, Switzerland 2019
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/24999/ http://umpir.ump.edu.my/id/eprint/24999/ http://umpir.ump.edu.my/id/eprint/24999/ http://umpir.ump.edu.my/id/eprint/24999/7/Effect%20of%20Dipotassium%20Hydrogen%20Phosphate1.pdf

id	ump-24999
recordtype	eprints
spelling	ump-249992019-12-13T07:38:41Z http://umpir.ump.edu.my/id/eprint/24999/ Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar Norbaizurah, Rahman Amalina Hanani, Ismail Kusbiantoro, Andri TA Engineering (General). Civil engineering (General) Adoption of coal fly ash (Class C) as the main source material for geopolymers would cause rapid setting to the fresh geopolymer mortar or concrete. This behaviour explained the limited application of this material in the construction industry. On the other hand, calcium nitrate (Ca(NO3)2) and dipotassium hydrogen phosphate (K2HPO4) are alternative admixtures that known to extend the setting time of fresh geopolymers. However, their effect on the strength and microstructural properties remain unclear due to the limitation of relevant literature from previous studies. Therefore, this study aims to investigate the effect of these admixtures in fly ash based geopolymer system, particularly to its strength performance. The effects of adding Ca(NO3)2 and K2HPO4 were evaluated at dosages of 0.5%, 1.5%, and 2.5% (by fly ash weight) in the geopolymer mixture, and samples were cured at room temperature. Hardened geopolymer specimens were measured for their compressive strength, porosity, and microstructural characteristic. The inclusion of 0.5% of alternative chemical reagents was found as the optimum proportion and able to enhance the compressive strength of the geopolymer mixtures. However, efflorescence was detected on the surface of the hardened specimen when K2HPO4 was included in its mixture. This phenomenon is influenced by the presence of monovalent and trivalent anions in the system namely nitrates and phosphates. In this study, each anion had a particular role in each stage of geopolymerisation, and determined the quality via crystal growth control and influenced the development of aluminosilicate structures. Trans Tech Publications, Switzerland 2019 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/24999/7/Effect%20of%20Dipotassium%20Hydrogen%20Phosphate1.pdf Norbaizurah, Rahman and Amalina Hanani, Ismail and Kusbiantoro, Andri (2019) Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar. Key Engineering Materials. ISSN 1013-9826 (print); 1662-9795 (online) (In Press) https://doi.org/10.4028/www.scientific.net/KEM.821.486 https://doi.org/10.4028/www.scientific.net/KEM.821.486
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) Norbaizurah, Rahman Amalina Hanani, Ismail Kusbiantoro, Andri Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar
description	Adoption of coal fly ash (Class C) as the main source material for geopolymers would cause rapid setting to the fresh geopolymer mortar or concrete. This behaviour explained the limited application of this material in the construction industry. On the other hand, calcium nitrate (Ca(NO3)2) and dipotassium hydrogen phosphate (K2HPO4) are alternative admixtures that known to extend the setting time of fresh geopolymers. However, their effect on the strength and microstructural properties remain unclear due to the limitation of relevant literature from previous studies. Therefore, this study aims to investigate the effect of these admixtures in fly ash based geopolymer system, particularly to its strength performance. The effects of adding Ca(NO3)2 and K2HPO4 were evaluated at dosages of 0.5%, 1.5%, and 2.5% (by fly ash weight) in the geopolymer mixture, and samples were cured at room temperature. Hardened geopolymer specimens were measured for their compressive strength, porosity, and microstructural characteristic. The inclusion of 0.5% of alternative chemical reagents was found as the optimum proportion and able to enhance the compressive strength of the geopolymer mixtures. However, efflorescence was detected on the surface of the hardened specimen when K2HPO4 was included in its mixture. This phenomenon is influenced by the presence of monovalent and trivalent anions in the system namely nitrates and phosphates. In this study, each anion had a particular role in each stage of geopolymerisation, and determined the quality via crystal growth control and influenced the development of aluminosilicate structures.
format	Article
author	Norbaizurah, Rahman Amalina Hanani, Ismail Kusbiantoro, Andri
author_facet	Norbaizurah, Rahman Amalina Hanani, Ismail Kusbiantoro, Andri
author_sort	Norbaizurah, Rahman
title	Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar
title_short	Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar
title_full	Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar
title_fullStr	Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar
title_full_unstemmed	Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar
title_sort	effect of dipotassium hydrogen phosphate and calcium nitrate on strength and microstructural properties of geopolymer mortar
publisher	Trans Tech Publications, Switzerland
publishDate	2019
url	http://umpir.ump.edu.my/id/eprint/24999/ http://umpir.ump.edu.my/id/eprint/24999/ http://umpir.ump.edu.my/id/eprint/24999/ http://umpir.ump.edu.my/id/eprint/24999/7/Effect%20of%20Dipotassium%20Hydrogen%20Phosphate1.pdf
first_indexed	2023-09-18T22:38:09Z
last_indexed	2023-09-18T22:38:09Z
_version_	1777416734923292672

Effect of Dipotassium Hydrogen Phosphate and Calcium Nitrate on Strength and Microstructural Properties of Geopolymer Mortar

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