Measurement of tensile bond strength of 3D printed geopolymer mortar

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Time gap effect on bond strength of 3D-printed concrete (2018, background): “The low strength is usually caused by the weak bonds inbetween the printed filament at the interfacial material shown in Figure 1 (Panda et al. 2018).”
Hardened properties of 3D printed concrete: The influence of process parameters on interlayer adhesion (2019, background): “[21] also studied the interface strength as a parameter of interlayer interval time, but additionally included print head speed and print nozzle height as variables.”
3D printing using concrete extrusion: A roadmap for research (2018, background): “Several factors limit the speed: inertia of the extruded material; limitations of the position apparatus, such as inertia in gantry systems [21] and point-to-point interpolation issues with robotics [14]; cycle-time between layers resulting in changes in material properties and hence the pumping and”
Improving printability of limestone-calcined clay-based cementitious materials by using viscosity-modifying admixture (2020, background): “Many studies [54,61,73,74] have already reported the reduction of interlayer strength due to the prolonged time gap.”