A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Collapse of fresh foam concrete: Mechanisms and influencing parameters
https://orcid.org/0000-0001-8055-8167
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.
Highlights Rheology and density influence the stability of fresh aerated concrete. Interstitial paste's yield stress below a critical value causes collapse. Higher yield stress in the interstitial paste results in poor hardened properties. Fresh aerated concrete displayed enhanced stability at lower densities. Drainage-based stability criteria captures the collapse behaviour well.
Collapse of fresh foam concrete: Mechanisms and influencing parameters
https://orcid.org/0000-0001-8055-8167
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.
Highlights Rheology and density influence the stability of fresh aerated concrete. Interstitial paste's yield stress below a critical value causes collapse. Higher yield stress in the interstitial paste results in poor hardened properties. Fresh aerated concrete displayed enhanced stability at lower densities. Drainage-based stability criteria captures the collapse behaviour well.
Collapse of fresh foam concrete: Mechanisms and influencing parameters
https://orcid.org/0000-0001-8055-8167
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.
Highlights Rheology and density influence the stability of fresh aerated concrete. Interstitial paste's yield stress below a critical value causes collapse. Higher yield stress in the interstitial paste results in poor hardened properties. Fresh aerated concrete displayed enhanced stability at lower densities. Drainage-based stability criteria captures the collapse behaviour well.
Collapse of fresh foam concrete: Mechanisms and influencing parameters
Dhasindrakrishna, K. (author) / Ramakrishnan, Sayanthan (author) / Pasupathy, Kirubajiny (author) / Sanjayan, Jay (author)
2021-06-21
Article (Journal)
Electronic Resource
English
Fresh State Characteristics of Foam Concrete
| Online Contents | 2008
Fresh State Characteristics of Foam Concrete
| British Library Online Contents | 2008
Parameters Influencing Collapse Resistance of Building Structures Subjected to Fire Loading
| British Library Conference Proceedings | 2013
Parameters Influencing the Stability of Foamed Concrete
| British Library Online Contents | 2018