Rheology characterization of 3D printing mortars with nanoclays and basalt fibers
Identifiers
Permanent link (URI): http://hdl.handle.net/10017/57866DOI: 10.1016/j.matpr.2023.07.151
ISSN: 2214-7853
Date
2023-07-22Funders
This study was partially funded by the Spanish Ministry of Science and Innovation, project Print3Dcement (grant number PID2019-106525RB-I00); by MCIN/AEI/10.13039/501100011033 and the European Union ‘‘NextGenerationEU”/PRTR, project CALTHED (grant number TED2021-132585B-100), and by the University of Alcalá, Grant for training of Lecturers (FPU-UAH 2019) and the trainee Research Personnel Mobility Grant (Movilidad PIF-UAH 2021). The authors acknowledge the experimental help of Sandipan Kaushik of Queen´s University Belfast (QUb). The authors also thank the materials’ supply of the company TOLSA GROUP S.A.
Bibliographic citation
Materials Today: Proceedings, 2023
Keywords
3D printing
Cement based system
Nanoclays
Basalt fibers
Shear yield stress
Structural build-up
Project
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106525RB-I00/ES/CONTROL REOLOGICO Y MONITORIZACION A EDADES TEMPRANAS DE SISTEMAS CEMENTANTES NANOMODIFICADOS DISEÑADAS PARA LA IMPRESION EN 3D/
info:eu-repo/grantAgreement/AEI//TED2021-132585B-100/ES//CALTHED
info:eu-repo/grantAgreement/EC//TED2021-132585B-100/EU//CALTHED
info:eu-repo/grantAgreement/UAH//FPU-UAH2019/ES//
info:eu-repo/grantAgreement/UAH//PIF-UAH2021/ES//
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
(c) 2023 Elsevier
Access rights
info:eu-repo/semantics/openAccess
Abstract
3D printing has become one of the most innovative technologies for cement-based systems (CBS). However, recent studies have shown some issues related to printability and buildability (water drainage, plugs on extruder die, spreading of first layer, etc). To achieve a proper rheology control of CBS, it is essential to adapt the material fresh state properties (initial shear yield stress and structural build-up). In this study, a reference cement-based mortar with fly ash (25%), a 1:1.5 binder to sand ratio and a 0.38 water to binder ratio was used. A polycarboxilate ether-based superplasticizer was added until a consistency of around 1 kPa, measured with the cone-penetration test, was reached. Then, small amounts of several types of nanoclays (NC) in powder and slurry form (sepiolite, attapulgite and bentonite) and natural fibers were added to modify mortar rheological properties. The aim of the study was to characterize the rheological properties of 3D printing mortar samples with NC and basalt fibers (BF) to understand printability and buildability of this material. Cone-penetration test, flow table test and slump test were used to characterize 3D printing capacities. The cone-penetration test was performed in stirred and left at rest samples to assess shear yield stress before and after material deposition. Nanoclays showed a remarkable capacity to retain water and avoid drainage during extrusion but also to increase fresh state strength of material over time. Besides, they increased shear yield stress over time when left at rest. On the contrary, samples stirred over time did not show any increase of shear yield stress, especially samples with slurry nanoclays. Natural fibers also reduced drainage and enhance printability control regarding to reference mortar. BF also enhanced a performance on stirred sample but showed slightly changes on structural build-up at rest, mainly governed by NC effect.
Files in this item
Files | Size | Format |
|
---|---|---|---|
rheology_varela_MTP_2023.pdf | 1.421Mb |
|
Files | Size | Format |
|
---|---|---|---|
rheology_varela_MTP_2023.pdf | 1.421Mb |
|
Collections
- ARQUITEC - Artículos [221]