The idea of being able to print a building sounds impressive, but the practical side is different. A building must be able to hold up for a long time. The construction technique of 3D printed concrete is being developed, and some researchers are working on finding out how to test the materials and joints.
What Is 3D Concrete Printing?
3D concrete printing is a construction method which uses layers of concrete to print parts of buildings. According to NIST, the application of this method is growing, including more complex projects.
It is important to note that while a wall might be printed, that is only a part of the whole building. Claims should state what was printed and what else was needed for the construction.
This differentiation is crucial, since one would not want to mistake a printed part for a whole building.
What Layers Can Tell Us
NIST notes that one of their areas of research is the connections between layers of materials. These bonds determine how well the structure will hold up, and there are other characteristics which need to be taken into account. It is not enough to look at a sample. A printed wall would look nice, but one would not be able to tell what condition the layers holding it together are in. It is important that the construction industry conducts studies which test physical components.
Why Speed Does Not Equal Stability
NIST points out that many traditional tests would not work for additive construction. NIST is working on adapting tests and developing new ways of sampling.
This point is related to the previous one, but it goes deeper into the issue. If a building can be printed, researchers would want to know if it would hold up over time and under pressure. This is not just a matter of preference, but one of practicality. A new method of production does not eliminate the need for materials to be tested. If a sample is taken, it should be representative of the whole. Speed is necessary, but so are stability and quality control. One cannot be assured of the final product without physical testing.
Why These Issues Matter
The construction industry is changing, thanks in part to 3D-printed concrete. This development is only one of many which will change the construction industry. The value of new methods of construction may not last if companies do not support the research and practical application of tests which support long-term performance.