Investigation of the engineering properties of phasechangeable material additive cement-based 3D printing mortars

The additive manufacturing method with three-dimensional (3D) printers, which has been spreading very rapidly in civil engineering applications recently, provides great benefits in terms of building structures and energy efficiency. One of the biggest problems encountered during the application in layers on top of each other without a mold is that the control of 3D printing mortar is very difficult. While the mortar should be able to flow easily through the outlet hose called nozzle without requiring much energy, it loses this fluidity quickly and does not spread overlapping layers. It is desired that the mortars underneath are not deformed. However, when the rheological properties of the printing mortar are not well designed, wall elements that are printed after a certain layer result in collapse. In the studies carried out until today, the design of mortars with high threshold tensions has been tried and partially successful. Also the thixotropy of fresh mortar It is also rheologically effective. In concrete technology, in addition to the term mortar, the term micro-concrete is also used for cement composites produced with aggregates below 1 mm. It is preferred to use the term micro-concrete for the fresh mixture to be produced, as a structure is tried to be formed with cement-based composite mixtures with printing elements. One of the most important problems of cement-based mortars that are printed is energy saving. Ordinary structures energy They provide their savings with the perforated brick or porous building materials used in the partitions. However, in 3D printed structures, wall elements are also constructed with mortars that are completely cement-based and have higher thermal conductivity coefficient compared to porous building materials. During the construction of the buildings, the inner parts of the walls are left with gaps. However, this situation is not sufficient in terms of energy efficiency. For this reason, 3D printing of phase-changing materials that have been used in building materials recently for energy efficiency The subject of the thesis is that it can be used in mortars and thus, the relogy, physical-mechanical properties of the mortars produced.