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Mechanical and microstructural evaluations of lightweight aggregate geopolymer concrete before and after exposed to elevated temperatures

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Main Authors: Omar A., Abdulkareem, Mohd Mustafa Al-Bakri, Abdullah, Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr., Khairul Nizar, Ismail, Assoc. Prof. Dr., Mohamed, Bnhussain, Prof. Dr.
Other Authors: eng.omar83@yahoo.com
Format: Article
Language:English
Published: MDPI, Basel, Switzerland 2014
Subjects:
Compressive strength
Elevated temperatures
Geopolymer
Lightweight geopolymer concrete
Thermal shrinkage
Online Access:http://dspace.unimap.edu.my:80/dspace/handle/123456789/32209
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spelling my.unimap-322092014-02-28T01:40:36Z Mechanical and microstructural evaluations of lightweight aggregate geopolymer concrete before and after exposed to elevated temperatures Omar A., Abdulkareem Mohd Mustafa Al-Bakri, Abdullah Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr. Khairul Nizar, Ismail, Assoc. Prof. Dr. Mohamed, Bnhussain, Prof. Dr. eng.omar83@yahoo.com mustafa_albakri@unimap.edu.my vc@unimap.edu.my nizar@unimap.edu.my bnhusain@kacst.edu.sa Compressive strength Elevated temperatures Geopolymer Lightweight geopolymer concrete Thermal shrinkage Link to publisher's homepage at http://www.mdpi.com/ This paper presents the mechanical and microstructural characteristics of a lightweight aggregate geopolymer concrete (LWAGC) synthesized by the alkali-activation of a fly ash source (FA) before and after being exposed to elevated temperatures, ranging from 100 to 800 °C. The results show that the LWAGC unexposed to the elevated temperatures possesses a good strength-to-weight ratio compared with other LWAGCs available in the published literature. The unexposed LWAGC also shows an excellent strength development versus aging times, up to 365 days. For the exposed LWAGC to the elevated temperatures of 100 to 800 °C, the results illustrate that the concretes gain compressive strength after being exposed to elevated temperatures of 100, 200 and 300 °C. Afterward, the strength of the LWAGC started to deteriorate and decrease after being exposed to elevated temperatures of 400 °C, and up to 800 °C. Based on the mechanical strength results of the exposed LWAGCs to elevated temperatures of 100 °C to 800 °C, the relationship between the exposure temperature and the obtained residual compressive strength is statistically analyzed and achieved. In addition, the microstructure investigation of the unexposed LWAGC shows a good bonding between aggregate and mortar at the interface transition zone (ITZ). However, this bonding is subjected to deterioration as the LWAGC is exposed to elevated temperatures of 400, 600 and 800 °C by increasing the microcrack content and swelling of the unreacted silicates. 2014-02-28T01:40:36Z 2014-02-28T01:40:36Z 2013 Article Materials, vol. 6(10), 2013, pages 4450-4461 1996-1944 http://www.mdpi.com/1996-1944/6/10/4450 http://dspace.unimap.edu.my:80/dspace/handle/123456789/32209 en MDPI, Basel, Switzerland
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 Compressive strength
Elevated temperatures
Geopolymer
Lightweight geopolymer concrete
Thermal shrinkage
spellingShingle Compressive strength
Elevated temperatures
Geopolymer
Lightweight geopolymer concrete
Thermal shrinkage
Omar A., Abdulkareem
Mohd Mustafa Al-Bakri, Abdullah
Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.
Khairul Nizar, Ismail, Assoc. Prof. Dr.
Mohamed, Bnhussain, Prof. Dr.
Mechanical and microstructural evaluations of lightweight aggregate geopolymer concrete before and after exposed to elevated temperatures
description Link to publisher's homepage at http://www.mdpi.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, Assoc. Prof. Dr.
Mohamed, Bnhussain, Prof. Dr.
format Article
author Omar A., Abdulkareem
Mohd Mustafa Al-Bakri, Abdullah
Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.
Khairul Nizar, Ismail, Assoc. Prof. Dr.
Mohamed, Bnhussain, Prof. Dr.
author_sort Omar A., Abdulkareem
title Mechanical and microstructural evaluations of lightweight aggregate geopolymer concrete before and after exposed to elevated temperatures
title_short Mechanical and microstructural evaluations of lightweight aggregate geopolymer concrete before and after exposed to elevated temperatures
title_full Mechanical and microstructural evaluations of lightweight aggregate geopolymer concrete before and after exposed to elevated temperatures
title_fullStr Mechanical and microstructural evaluations of lightweight aggregate geopolymer concrete before and after exposed to elevated temperatures
title_full_unstemmed Mechanical and microstructural evaluations of lightweight aggregate geopolymer concrete before and after exposed to elevated temperatures
title_sort mechanical and microstructural evaluations of lightweight aggregate geopolymer concrete before and after exposed to elevated temperatures
publisher MDPI, Basel, Switzerland
publishDate 2014
url http://dspace.unimap.edu.my:80/dspace/handle/123456789/32209
_version_ 1643796831930417152
score 13.22586

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