The rapid depletion of natural aggregate resources is progressively becoming a significant environmental and ecological burden, accelerating the development of alternative aggregate production methods. Aggregate production with alternative methods has gradually become a popular subject in recent years in an effort to reduce the lack of natural aggregates and the deterioration of land geography. Phase change materials (PCM) are substances capable of storing and releasing large amounts of thermal energy during melting and solidification and are often mixed into concrete as artificial aggregate or via encapsulation. In addition, in order for PCM in liquid form to perform well in concrete, it is necessary to prevent its evaporation. Hence, in this study, the artificial aggregates were produced with various types of 3D printers using a novel methodology, and the effect of these aggregates on the mechanical and thermal properties of alkali-activated concrete (AAC) was assessed. In order to ameliorate the thermal properties of AAC, the liquid PCM was injected into the artificial aggregates and mixed into the concrete. The experimental results showed that the artificial aggregates can be successfully manufactured using different types of 3D printers. The aggregates manufactured wih SLA type 3D printers (SA) performed better mechanical properties than the aggregates manufactured with FDM type 3D printer (FA). The particle strength values of FA were found to change depending on the layer direction, while SA exhibited similar particle strength values with different layer directions. In addition, incorporating 15% FA or SA delayed the temperature reduction on the concrete surface. ORCID NO: 0000-0002-1488-5028
Anahtar Kelimeler: 3D-printing, Alkali-activation, Aggregate manufacturing, Phase change materials, Sustainability
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