An approach to develop printable strain hardening cementitious composites

By Stefan Chaves Figueiredo, C. Romero Rodriguez, Z. Ahmed, D. Bos, Yading Xu, Tam Theo Salet, O. Çopuroğlu, Erik Schlangen, Fred Bos. Materials & Design (1980-2015), 2019

178 citations recorded by the source corpus.

Abstract New additive manufacturing methods for cementitious materials hold a high potential to increase automation in the construction industry. However, these methods require new materials to be developed that meet performance requirements related to specific characteristics of the manufacturing process. The appropriate characterization methods of these materials are still a matter of debate. This study proposes a rheology investigation to systematically develop a printable strain hardening cementitious composite mix design. Two known mixtures were employed and the influence of several parameters, such as the water-to-solid ratio, fibre volume percentage and employment of chemical admixtures, were investigated using a ram extruder and Benbow-Bridgwater equation. Through printing trials, rheology parameters as the initial bulk and shear yield stress were correlated with variables commonly employed to assess printing quality of cementitious materials. The rheology properties measured were used to predict the number of layers a developed mixture could support. Selected mixtures had their mechanical performance assessed through four-point bending, uni-axial tensile and compressive strength tests, to confirm that strain hardening behaviour was obtained. It was concluded that the presented experimental and theoretical framework are promising tools, as the bulk yield stress seems to predict buildability, while shear yield stress may indicate a threshold for pumpability.

Subfields: Automotive Engineering, Building and Construction, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/1157e2667f8d0482f71a37dd08344b820cfe76b3

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Citations in the corpus

3D-printable engineered cementitious composites (3DP-ECC): Fresh and hardened properties (2021, background): “However, inferior tensile properties compared to those of cast ECC have also been reported, possibly a result of different material composition, delivery and extrusion systems [20].”
Investigation of the properties of alkali-activated slag mixes involving the use of nanoclay and nucleation seeds for 3D printing (2020, background): “In terms of materials, most of the printable mixtures contain ordinary Portland 42 cement (PC) as the prime binder material due to its inherent thixotropic properties that originate 43 from the combined effect of interparticle, gravitational and inertial forces [13-17].”
Improving printability of limestone-calcined clay-based cementitious materials by using viscosity-modifying admixture (2020, background): “Many studies have attempted to utilize a combination of HPMC and superplasticizer to develop printable cementitious materials [8,29,31,38,44].”
On the emergence of 3D printable Engineered, Strain Hardening Cementitious Composites (ECC/SHCC) (2020, background): “The assessment of rheological properties increases the chance of success in developing new materials for 3DCP [19].”