Thermal performance of cement-leca composites for 3D printing

•3DCP compositions with thermal conductivity 50% lower than with conventional aggregate;•Light building materials with high inner-outer wall thermal gradient;•Expanded clay did not significantly affect the physical and mechanical properties. This work aimed to evaluate the influence conventional fin...

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Bibliographic Details
Published in:Construction & building materials 2022-09, Vol.349, p.128771, Article 128771
Main Authors: Araújo, Rísia A., Martinelli, Antônio E., Cabral, Kleber C., F. O. A. Dantas, André, F. D. Silva, Iago, A. C. Xavier, Allynson, Santos, Ana L.
Format: Article
Language:English
Subjects:
3D concrete printing
Light expanded clay aggregate
Mix design
Squeeze flow rheology
Thermal comfort
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Summary:•3DCP compositions with thermal conductivity 50% lower than with conventional aggregate;•Light building materials with high inner-outer wall thermal gradient;•Expanded clay did not significantly affect the physical and mechanical properties. This work aimed to evaluate the influence conventional fine aggregate substitution by LECA (light expanded clay aggregate) evaluating the physical and mechanical properties of lightweight cement-based composites for 3D printing. The mixtures were formulated using a 22 central composite rotatable design (CCRD). The independent factors were the substitution content of sand and the aggregate-to-binder ratio. The results showed that the replacement of sand by LECA increased the thermal insulation without compromising important structural properties such as mechanical strength and porosity. The thermal behavior of the composites was modeled and an equation dependent only on the substitution content was found.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2022.128771