The effect of loading direction on the compressive behaviour of a 3D printed cement-based material

Abstract

<p>Nowadays, additive manufacturing is being widely employed in several areas and is starting to be considered for the construction sector amongst the digital construction trend. The advantages that the additive manufacturing techniques can bring over the traditional construction methods are propelling multiple research projects within the field of 3D concrete printing. Technologies used for printing, material compositions and their rheological and mechanical properties are some of the research areas on 3D concrete printing. In this work, it is used a wet extrusion method for printing a cement-based mortar mixture. The compressive behaviour of printed specimens was evaluated based on the direction of loading. The results showed that with a proper printing process and rheological properties, in the case of the current mid-strength matrix, the effect of the layers interfacial behaviour on the compressive behaviour of printed specimens was reduced.</p>

Structural Design and Testing of Digitally Manufactured Concrete Structures

“…This can be due to well-known or yet unrecognised influencing factors. The directional dependency of strength properties was recognised at an early stage by (Le et al 2012), and has been the topic of a considerable number of studies (Feng et al 2015;Nerella et al 2016;Zareiyan and Khoshnevish 2017;Panda et al 2017Paul et al;Van Der Putten et al 2019;Marchment et al 2017;Keita et al (2019); Zahabizadeh et al 2019), a summary of which is provided by (Timothy et al 2018). However, because these studies have tended to be phenomenological in nature, rather than theoretical and explanatory, this has not yet resulted in a full understanding of the impact of layering and time between consecutive layers.…”

Development of cement-based mortars for 3D printing through wet extrusion

“…The compressive behaviour of the printed specimens was assessed based solely on the application of the load parallel to the layer's direction, since the main scope of this paper was to design matrices and assess their requirements in IABSE Symposium 2019 Guimarães: Towards a Resilient Built Environment -Risk and Asset Management March 27-29, 2019, Guimarães, Portugal the fresh state to be used in 3D printing of concrete. A detailed discussion about the influence of loading direction regarding the printing direction on the compressive behaviour of printed specimens can be found elsewhere [21]. For each series, five printed specimens and five mould cast specimens were used.…”