Influence of recycled concrete aggregate on the foam stability of aerated geopolymer concrete

Article

Pasupathy, Kirubajiny, Ramakrishnan, Sayanthan and Sanjayan, Jay. 2021. "Influence of recycled concrete aggregate on the foam stability of aerated geopolymer concrete." Construction and Building Materials. 271. https://doi.org/10.1016/j.conbuildmat.2020.121850
Article Title

Influence of recycled concrete aggregate on the foam stability of aerated geopolymer concrete

ERA Journal ID3470
Article CategoryArticle
AuthorsPasupathy, Kirubajiny, Ramakrishnan, Sayanthan and Sanjayan, Jay
Journal TitleConstruction and Building Materials
Journal Citation271
Article Number121850
Number of Pages11
Year2021
PublisherElsevier
Place of PublicationNetherlands
ISSN0950-0618
Digital Object Identifier (DOI)https://doi.org/10.1016/j.conbuildmat.2020.121850
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S095006182033854X
AbstractThe effect of recycled concrete aggregates (RCA) in enhancing the foam stability and hardened properties of aerated geopolymer concrete (GFC) produced by a mechanical foaming method is investigated. The RCA was used as a partial or full replacement to fine aggregates, and approximately the same amounts of foam were used in all mixes to achieve a targeted density of 800 kg/m3. Despite the same water/binder and activator/binder ratios in all mixes, the fresh and hardened properties of GFC significantly varied between mixes. The instability of fresh geopolymer mix, caused by the collapse of air bubbles and the settlement was identified as a major issue in the control GFC mix. The use of RCA in GFC has significantly improved the foam stability with a significant reduction in settlement. The foam stability criterion was correlated to the yield stress development of base mixes, where the addition of RCA increases the initial yield stress and yield stress development over time. This has significantly influenced the stability of bubbles in GFC. On the other hand, the setting time of the geopolymer has reduced with the increasing RCA content. Nevertheless, the foam instability and corresponding settlement were stabilized well ahead of the initial setting time, indicating the setting of geopolymer has less impact on the foam instability in GFCs. The XRD and TGA analyses detect the presence of Ca(OH)2 in RCA, which increases the yield stresses of fresh geopolymer pastes. The variation in foam stability was well reflected on the hardened properties of GFC, such as porosity, pore size distribution, and thermal properties.
KeywordsAerated geopolymer concrete; Foam stability; Recycled concrete aggregate; Rheology; Thermal properties
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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