DC4T (Double Corbel Concrete or Clay Calibration Test)

This is a calibration print for cement, clay, geopolymer, earth or similar materials provided to accelerate the development of printable cementitious materials.

This shape was designed to print with a single wall in "spiral" or "vase" mode to avoid creating a seam.

Use skirt rings to purge material when printing sequential compositions. Increase number of rings for additional material before printing test.

Original Scale was 400x200x200mm but these dimensions can be adjusted to suit needs.

This shape is a simplified adaptation of polymer calibration tests with the following features:

• Material for 6x flexural strength prisms, 6x split tensile cylinders and many compressive strength cubes via saw cutting or core drilling (respectively) or waterjet.
• As-printed compressive strength of bottom layers; adjustable with print speed
• Overhang capability
• First layer flow calibration
• A fully-filled second layer can seal the structure to test water-holding capability

Bridging test square on top layer

• One half of this this shape might be useful as a "corbel" type element added to large 3D printed projects. This corbel element could be removed after printing and used to generate test specimens for each layer represented.