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 |
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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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