| Issue |
MATEC Web Conf.
Volume 409, 2025
Concrete Solutions 2025 – 9th International Conference on Concrete Repair, Durability & Technology
|
|
|---|---|---|
| Article Number | 06005 | |
| Number of page(s) | 9 | |
| Section | Concrete and Admixture Technology 1 | |
| DOI | https://doi.org/10.1051/matecconf/202540906005 | |
| Published online | 13 June 2025 | |
Exploratory study on the rheological behaviour of 3D printable mortars incorporating fine recycled concrete aggregates (FRCA)
1 *Programa de Pós-Graduação em Engenharia Civil (PGECiv), Universidade Estadual de Londrina (UEL), Rodovia Celso Garcia Cid, PR-445, km 380, 86057-970, Londrina, PR, Brazil; eduardoklsb@gmail.com (E.K.S.); toralles@uel.br (B.M.T.)
2 Laboratório Nacional de Engenharia Civil (LNEC), Av. do Brasil, 101, 1700-066 Lisbon, Portugal; mvieira@lnec.pt (M.G.V.)
3 Sustainable Construction Materials Association (C5Lab), Edifício Central Park, Rua Central Park 6, 2795-242 Linda-a-Velha, Portugal; ksantos@c5lab.pt (K.F.S); ssantos@c5lab.pt (S.P.S)
* Corresponding author: eduardoklsb@gmail.com
This study investigates the rheological behaviour of 3D-printable mortars incorporating fine recycled concrete aggregates (FRCA), focusing on the influence of 25% and 50% FRCA substitution on key rheological parameters, such as flow spread, penetration resistance, shear stress, and yield stress over time. Rheological tests were conducted at 20, 40, and 60 minutes to capture the time-dependent behaviour of the mixtures. The flow spread test evaluated the mortar’s consistency and ability to maintain workability over time, essential for continuous extrusion during the printing process. The penetration resistance test assessed the stiffening rate of the mortar, providing insights into setting time and early strength development. The vane and slug tests measured yield stress, a critical parameter for ensuring buildability and layer stability, indicating the mixture’s capacity to support subsequent layers without deformation or collapse. The results from the reference mixture were used to compare the performance of mortars with 25% and 50% FRCA content, highlighting the impact of recycled aggregates on time-dependent rheological properties. Mortars containing FRCA exhibited differences in flow retention and yield stress evolution, which are key factors influencing extrudability and printability in additive manufacturing processes.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.