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On entrained pore size distribution of foamed concrete

Hilal, Ameer Abdulrahman; Thom, Nicholas; Dawson, Andrew

Authors

Ameer Abdulrahman Hilal ameer_amn@yahoo.com

NICK THOM nicholas.thom@nottingham.ac.uk
Assistant Professor

Andrew Dawson



Abstract

The pore structure of foamed concrete is a significant characteristic since it affects properties such as strength and durability. To investigate these properties, the determination of total air voids content is not sufficient as the shape, size and distribution of air voids may also be influential. To understand the formation of voids after hardening, an investigation of the bubble size distribution of foam (before adding to the mixture) and the pore size distribution of the foamed concrete mixes (after hardening) is discussed in this paper. These distributions have been quantified by examining selected size parameters to make a comparison between them. In addition, void circularity factors have been determined to examine the phenomenon of voids merging. In order to investigate the foam structure before adding to the mix, it was found that by treating the foam with bitumen emulsion, a clear image of its structure can be captured using an optical microscope. Using this technique, a significant difference was found between the size distribution of foam bubbles and those of air pores within foamed concrete mixes. From circularity factor results, there is evidence for increased bubble merging with increased added foam volume (decreased density).

Journal Article Type Article
Publication Date Jan 30, 2015
Journal Construction and Building Materials
Print ISSN 0950-0618
Electronic ISSN 1879-0526
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 75
APA6 Citation Hilal, A. A., Thom, N., & Dawson, A. (2015). On entrained pore size distribution of foamed concrete. Construction and Building Materials, 75, https://doi.org/10.1016/j.conbuildmat.2014.09.117
DOI https://doi.org/10.1016/j.conbuildmat.2014.09.117
Keywords Foamed concrete, Pore structure, Circularity factor, Optical microscope, Image processing
Publisher URL https://doi.org/10.1016/j.conbuildmat.2014.09.117
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0



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