As part of an inter-laboratory study into the mechanical properties of 3D-printed concrete, we are involved in four articles in the RILEM journal Materials and Structures. The open-access articles can be downloaded free of charge using the respective links.
As coordinator of the inter-laboratory study, Freek Bos and other authors published the following two articles: Mechanical properties of 3D printed concrete: a RILEM TC 304-ADC Interlaboratory Study - Approach and Main results (link) and Mechanical properties of 3D printed concrete: a RILEM TC 304-ADC interlaboratory study - flexural and tensile strength (link)
Daniel Auer and Freek Bos, among other authors, have also co-authored the following two articles: Mechanical properties of 3D printed concrete: a RILEM TC 304-ADC interlaboratory study-Design and implementation of a database system for querying, sharing, and analysing experimental data (link) and Mechanical properties of 3D printed concrete: a RILEM 304-ADC interlaboratory study - compressive strength and modulus of elasticity (link)