Effect of yield stress development on the foam-stability of aerated geopolymer concrete

Article

Dhasindrakrishna, K., Pasupathy, K., Ramakrishnan, Sayanthan and Sanjayan, Jay. 2020. "Effect of yield stress development on the foam-stability of aerated geopolymer concrete." Cement and Concrete Research. 138. https://doi.org/10.1016/j.cemconres.2020.106233
Article Title

Effect of yield stress development on the foam-stability of aerated geopolymer concrete

ERA Journal ID4164
Article CategoryArticle
AuthorsDhasindrakrishna, K., Pasupathy, K., Ramakrishnan, Sayanthan and Sanjayan, Jay
Journal TitleCement and Concrete Research
Journal Citation138
Article Number106233
Number of Pages9
Year2020
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0008-8846
1873-3948
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cemconres.2020.106233
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0008884620306001
AbstractThis study investigates the instability of fresh geopolymer foam concrete (GFC) synthesised through the pre-foaming technique, particularly at ultra-low densities (430–460 kg/m3). Initial setting time and the yield stress development with time were measured for the base mixes and correlated to the level of stability. We observed that the foam stability was established through the yield stress development at the start, well before the initial setting of the binder. The settlement was noticeably reduced when the initial yield stress satisfied the stability criterion to prevent drainage. The base mix with the highest initial yield stress and the fastest yield stress development rate displayed the highest level of stability in the fresh GFC. Apart from the direct measurement of settlement, foam stability was well reflected in the hardened properties of the GFC such as pore size distribution, pore homogeneity and mechanical strength.
KeywordsGeopolymer foam; Rheology; Alkali activated foam ; Settlement; Drainage
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400505. Construction materials
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Byline AffiliationsSwinburne University of Technology
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