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Effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete

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Main Authors: Omar A., Abdulkareem, Mohd Mustafa Al Bakri, Abdullah, Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr., Khairul Nizar, Ismail, Dr., Saif, Ala’eddin A.
Other Authors: eng.omar83@yahoo.com
Format: Article
Language:English
Published: Elsevier 2014
Subjects:
Lightweight geopolymer
Thermal shrinkage
SEM
Elevated temperature
Thermal expansion
Compressive strength
Online Access:http://dspace.unimap.edu.my:80/dspace/handle/123456789/32776
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spelling my.unimap-327762014-03-15T04:36:12Z Effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete Omar A., Abdulkareem Mohd Mustafa Al Bakri, Abdullah Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr. Khairul Nizar, Ismail, Dr. Saif, Ala’eddin A. eng.omar83@yahoo.com Lightweight geopolymer Thermal shrinkage SEM Elevated temperature Thermal expansion Compressive strength Link to publisher's homepage at http://www.elsevier.com This paper reports a comparative study of the influence of elevated temperature on geopolymer paste, mortars and lightweight aggregate geopolymer concrete (LWAGC) systems made by using fly ash (FA) as only source material. The mechanical, thermo-physical and macro/micro-structural properties of the geopolymers before and after the exposure to elevated temperatures of 400, 600 and 800 °C have been investigated. The sequential changes in the geopolymeric gel structure upon the exposure to the elevated temperature and their reflections on the geopolymers thermal behavior have been also explored. The physical properties of the unexposed geopolymers to elevated temperatures show that the LWAGC possesses lower density and water absorption than the geopolymer paste and mortar. The mechanical strength of the geopolymer materials prior firing shows that the geopolymer paste and mortar possesses significantly high strength compared to the LWAGC, due to the lightweight aggregate (LWA) low strength and porous microstructure. It is found that the relatively high activator content used to activate the raw material, FA, results in excellent mechanical and microstructural properties for the unexposed geopolymers to elevated temperatures. While, it is significantly participating in the deterioration of the geopolymers mechanical and physical properties after exposed to the elevated temperatures especially at 800 °C by producing high unreacted silicate species. Introducing the LWAs to the geopolymeric structure considerably enhances the mechanical and microstructural properties of the geopolymers at elevated temperatures. This is attributed to the low thermal conductivity characteristics of the LWAs which inhibited the heat diffusion through the structure. The reported excellent thermal performance of LWAGCs at the elevated temperatures would increase the suggested application for this novel environmentally-friendly material. 2014-03-15T04:36:12Z 2014-03-15T04:36:12Z 2014-01 Article Construction and Building Materials, vol.50, 2014, pages 377–387 0950-0618 http://dspace.unimap.edu.my:80/dspace/handle/123456789/32776 http://www.sciencedirect.com/science/article/pii/S0950061813008878 http://dx.doi.org/10.1016/j.conbuildmat.2013.09.047 en Elsevier
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 Lightweight geopolymer
Thermal shrinkage
SEM
Elevated temperature
Thermal expansion
Compressive strength
spellingShingle Lightweight geopolymer
Thermal shrinkage
SEM
Elevated temperature
Thermal expansion
Compressive strength
Omar A., Abdulkareem
Mohd Mustafa Al Bakri, Abdullah
Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.
Khairul Nizar, Ismail, Dr.
Saif, Ala’eddin A.
Effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete
description Link to publisher's homepage at http://www.elsevier.com
author2 eng.omar83@yahoo.com
author_facet eng.omar83@yahoo.com
Omar A., Abdulkareem
Mohd Mustafa Al Bakri, Abdullah
Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.
Khairul Nizar, Ismail, Dr.
Saif, Ala’eddin A.
format Article
author Omar A., Abdulkareem
Mohd Mustafa Al Bakri, Abdullah
Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.
Khairul Nizar, Ismail, Dr.
Saif, Ala’eddin A.
author_sort Omar A., Abdulkareem
title Effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete
title_short Effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete
title_full Effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete
title_fullStr Effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete
title_full_unstemmed Effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete
title_sort effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete
publisher Elsevier
publishDate 2014
url http://dspace.unimap.edu.my:80/dspace/handle/123456789/32776
_version_ 1643796981852667904
score 13.222552

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