On entrained pore size distribution of foamed concrete

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

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).

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

• Journal Article Type: Article
• Acceptance Date: Sep 18, 2014
• Online Publication Date: Nov 28, 2014
• Publication Date: Jan 30, 2015
• Deposit Date: Aug 2, 2017
• Publicly Available Date: Aug 2, 2017
• Journal: Construction and Building Materials
• Print ISSN: 0950-0618
• Electronic ISSN: 1879-0526
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 75
• DOI: https://doi.org/10.1016/j.conbuildmat.2014.09.117
• Keywords: Foamed concrete, Pore structure, Circularity factor, Optical microscope, Image processing
• Public URL: https://nottingham-repository.worktribe.com/output/742222
• Publisher URL: https://doi.org/10.1016/j.conbuildmat.2014.09.117
• Contract Date: Aug 2, 2017