2.3. Proof of usability
Concrete is regarded as a homogeneous, joint-free material in the
construction industry. However, this cannot be assumed for additive
manufacturing, since several layers of concrete are build up. Due to the
production-related anisotropy, the compressive strength was determined
in three load directions. Figure 1 serves to clarify the load directions
and the designation. Here, the placement direction is in the
X-direction. The installation height in the Z-direction is based on the
number and dimensions of the layers. The width of the component in the
Y-direction is depending on the width and number of the extrudate.
Furthermore, samples were produced in two ways: the concrete was
injected directly and extruded into the moulds.