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Development of kaolin based geopolymer coating for lumber wood applications

Doctor of Philosophy in Materials Engineering

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Bibliographic Details
Main Author: Shamala, Ramasamy
Other Authors: Kamarudin, Hussin, Brig. Jen. Datuk Prof. Emeritus Dr.
Format: Thesis
Language:English
Published: Universiti Malaysia Perlis (UniMAP) 2018
Subjects:
Coatings
Kaolin
Inorganic polymers
Lumber
Geopolymer
Online Access:http://dspace.unimap.edu.my:80/xmlui/handle/123456789/78811
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spelling my.unimap-788112023-05-24T07:36:35Z Development of kaolin based geopolymer coating for lumber wood applications Shamala, Ramasamy Kamarudin, Hussin, Brig. Jen. Datuk Prof. Emeritus Dr. Coatings Kaolin Inorganic polymers Lumber Geopolymer Doctor of Philosophy in Materials Engineering The use of ordinary Portland cement is evident for centuries now especially in civil industries. Lacking of greener option with equal or enhanced properties forced consumers to ignore the shortcomings of ordinary Portland cement. Investigation of kaolin based geopolymer coating was aimed to not only increase the productivity and applications of geopolymer but also to potentially replace the use of ordinary Portland cement in terms of coating technology. Initial aim for this study was to prepare an optimum geopolymer coating paste made up of kaolin, as the aluminosilicate source and alkaline activator solution. The optimum mix design was mainly judged by its mechanical strength, followed by physical, phase analysis and scanning electron microscopy micrographs as crucial parameters of sodium chloride concentration, solids-to-liquid (S/L) ratio and alkaline activator ratio was studied. Kaolin, the geopolymer source material was characterized by using particle size analysis, phase, chemical composition, and scanning electron microscopy testing. Kaolin geopolymer paste with 8 M sodium hydroxide molarity, solids-to-liquid (S/L) ratio of 0.9 and alkaline activator ratio of 0.40 cured at 70 °C for 24 hours, gave highest strength values of 2.4 MPa (7 days), 2.98 MPa (28 days) and 4.56 MPa (90 days). This mix design also proven to have good workability, density, semi crystalline phase, and homogeneous compacted geopolymer matrix through morphology micrographs, in agreement to strength values. Continues improvement of kaolin geopolymer paste over time showed promising potentials towards preparation of kaolin based geopolymer coating. To the best of our knowledge, no attempts have been made previously to produce kaolin based geopolymer coating for lumber wood application, thus making it a novel work. The geopolymer paste were then coated on most unlikely substrate to investigate the extent of its bonding capabilities. This was evidently studied through bonding, physical, mechanical and morphological results. Optimum kaolin geopolymer coating successfully adhered to lumber wood substrate and provided high strength value of 4.3 MPa (7 days), 4.9 MPa (28 days) and 5.96 MPa (90 days). Early mechanical strength of kaolin geopolymer coated lumber wood differs from mechanical strength exhibited by kaolin geopolymer paste due to moisture absorption into substrate as supported by interfacial layer micro images. Hardness value was in agreement with flexural strength of kaolin geopolymer coated lumber wood and phase analysis of kaolin geopolymer paste. Zeolite peak contributes to high early strength development but disrupts geopolymer structure over time that leads to drop in strength upon sample age. Investigation of sample over different time period is proven to be important for long term usage of geopolymer coating. Ultimately, this study clearly demonstrated the processing and feasibility of kaolin geopolymer coating material. 2018 2023-05-24T07:36:35Z 2023-05-24T07:36:35Z Thesis http://dspace.unimap.edu.my:80/xmlui/handle/123456789/78811 en Universiti Malaysia Perlis (UniMAP) Universiti Malaysia Perlis (UniMAP) School of Materials Engineering
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Coatings
Kaolin
Inorganic polymers
Lumber
Geopolymer
spellingShingle Coatings
Kaolin
Inorganic polymers
Lumber
Geopolymer
Shamala, Ramasamy
Development of kaolin based geopolymer coating for lumber wood applications
description Doctor of Philosophy in Materials Engineering
author2 Kamarudin, Hussin, Brig. Jen. Datuk Prof. Emeritus Dr.
author_facet Kamarudin, Hussin, Brig. Jen. Datuk Prof. Emeritus Dr.
Shamala, Ramasamy
format Thesis
author Shamala, Ramasamy
author_sort Shamala, Ramasamy
title Development of kaolin based geopolymer coating for lumber wood applications
title_short Development of kaolin based geopolymer coating for lumber wood applications
title_full Development of kaolin based geopolymer coating for lumber wood applications
title_fullStr Development of kaolin based geopolymer coating for lumber wood applications
title_full_unstemmed Development of kaolin based geopolymer coating for lumber wood applications
title_sort development of kaolin based geopolymer coating for lumber wood applications
publisher Universiti Malaysia Perlis (UniMAP)
publishDate 2018
url http://dspace.unimap.edu.my:80/xmlui/handle/123456789/78811
_version_ 1772813214122246144
score 13.160551

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