Collapse of fresh foam concrete: Mechanisms and influencing parameters

Article

Dhasindrakrishna, K., Ramakrishnan, Sayanthan, Pasupathy, Kirubajiny and Sanjayan, Jay. 2021. "Collapse of fresh foam concrete: Mechanisms and influencing parameters." Cement and Concrete Composites. 122. https://doi.org/10.1016/j.cemconcomp.2021.104151

Article Title	Collapse of fresh foam concrete: Mechanisms and influencing parameters
ERA Journal ID	21082
Article Category	Article
Authors	Dhasindrakrishna, K., Ramakrishnan, Sayanthan, Pasupathy, Kirubajiny and Sanjayan, Jay
Journal Title	Cement and Concrete Composites
Journal Citation	122
Article Number	104151
Number of Pages	11
Year	2021
Publisher	Elsevier
Place of Publication	United Kingdom
ISSN	0958-9465
	1873-393X
Digital Object Identifier (DOI)	https://doi.org/10.1016/j.cemconcomp.2021.104151
Web Address (URL)	https://www.sciencedirect.com/science/article/pii/S0958946521002195
Abstract	This study assesses the influence of rheology and density on the collapse behaviour of mechanically foamed fresh aerated concrete. The collapse mechanism was studied under two conditions of varying interstitial paste's rheology and varying foam content. Adequate yield stress in the interstitial cement paste (critical yield stress) is crucial to achieve stability, below which the foam concrete displays partial or complete collapse. However, higher yield stresses may affect the hardened properties, thus an optimum range is important. Besides, this critical yield stress decreases with the foam content, leading to enhanced stability at lower densities. The critical yield stress to prevent collapse was then experimentally determined and compared against the yield stresses required to prevent the rising of bubbles (buoyancy) and the flow of interstitial paste through the foam network (drainage). This comparison showed that the experimentally determined critical yield stress to prevent foam collapse agrees well with the drainage-based stability criteria.
Keywords	Aerated concrete; Lightweight concrete ; Porosity; Drainage; Rheology; Stability
Contains Sensitive Content	Does not contain sensitive content
ANZSRC Field of Research 2020	400505. Construction materials
Public Notes	Files associated with this item cannot be displayed due to copyright restrictions.
Byline Affiliations	Swinburne University of Technology

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