Enhancing the properties of foam concrete 3D printing using porous aggregates

Article

Pasupathy, Kirubajiny, Ramakrishnan, Sayanthan and Sanjayan, Jay. 2022. "Enhancing the properties of foam concrete 3D printing using porous aggregates." Cement and Concrete Composites. 133. https://doi.org/10.1016/j.cemconcomp.2022.104687
Article Title

Enhancing the properties of foam concrete 3D printing using porous aggregates

ERA Journal ID21082
Article CategoryArticle
AuthorsPasupathy, Kirubajiny, Ramakrishnan, Sayanthan and Sanjayan, Jay
Journal TitleCement and Concrete Composites
Journal Citation133
Article Number104687
Number of Pages13
Year2022
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0958-9465
1873-393X
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cemconcomp.2022.104687
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0958946522002803
Abstract

The lightweight concrete (density <1000 kg/m3) is generally attained by introducing a large amount of air voids into fresh concrete for making so-called foam concrete. Such foam concrete is quite challenging in 3D concrete printing due to the high flowability of fresh mixes affecting the printability and foam stability during extrusion process. To overcome these limitations, this study investigates a combination of lightweight aggregates and premade foam in foam concrete to attain a density below 1000 kg/m3 for 3D printing applications. The expanded perlite (EP) aggregate was used as a replacement for fine sand that substantially reduced the foam content in the mix. The effect of EP on the fresh state properties such as rheology and printability as well as hardened properties including, mechanical properties, porosity and pore size distribution were investigated. It was demonstrated that the introduction of combined lightweight aggregate and foam has significantly improved the fresh and hardened properties of produced lightweight concrete. For instance, fresh foam concrete containing EP aggregate displayed high yield strength and apparent viscosity compared to the foam concrete without EP at similar densities. The compressive strength of 3D printed specimens containing EP was determined as 12.95 MPa, 15.5 MPa and 10.6 MPa in the perpendicular, longitudinal, and lateral directions respectively, compared to 5.5 MPa, 8.4 MPa and 4.2 MPa for the sand group at the similar density. Moreover, fine and regular pore size distribution was observed for 3D printed foam concrete with EP aggregate.

KeywordsCompressive strength ; Expanded; Porosity; Rheological properties ; 3D printing ; Foam concrete
ANZSRC Field of Research 2020400505. Construction materials
401401. Additive manufacturing
401602. Composite and hybrid materials
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Byline AffiliationsSwinburne University of Technology
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