Synthesis and performance of intumescent alkali-activated rice husk ash for fire-resistant applications

Article

Dhasindrakrishna, K., Ramakrishnan, Sayanthan, Pasupathy, Kirubajiny and Sanjayan, Jay. 2022. "Synthesis and performance of intumescent alkali-activated rice husk ash for fire-resistant applications." Journal of Building Engineering. 51. https://doi.org/10.1016/j.jobe.2022.104281
Article Title

Synthesis and performance of intumescent alkali-activated rice husk ash for fire-resistant applications

ERA Journal ID210809
Article CategoryArticle
AuthorsDhasindrakrishna, K., Ramakrishnan, Sayanthan, Pasupathy, Kirubajiny and Sanjayan, Jay
Journal TitleJournal of Building Engineering
Journal Citation51
Article Number104281
Number of Pages15
Year2022
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN2352-7102
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jobe.2022.104281
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S2352710222002947
AbstractThis study investigates intumescent alkali-activated rice husk ash (RHA) as an alternative to conventional fire-resistant building systems such as aerated concrete panels. The alkali-activation of RHA forms a polymerised sodium silicate gel. Its intumescence is caused by simultaneous softening and the evaporation of water. The softening behaviour was observed with the glass transition of the material occurring at 120 °C. Meanwhile, physically adsorbed water and hydroxyl groups vapourising after the onset of glass transition act as the blowing agent to form the porous structure. The fire resistance of the intumescent alkali-activated RHA panel was assessed through its insulation capacity at elevated temperatures up to 1000 °C. It was also compared against conventional aerated fly ash-based geopolymer panels with similar weight per unit area at two different densities (600 kg/m3 and 1000 kg/m3). The alkali-activated RHA panel, despite being 60% smaller in thickness, showed a better insulation capacity than the aerated geopolymers.
KeywordsRice hull ash; Fire resistance ; Foam concrete ; Geopolymer; Glass transition ; Porosity
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400505. Construction materials
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Byline AffiliationsSwinburne University of Technology
School of Engineering
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