Development Of Constructıon Demolıtıon Waste-Based Geopolymerıc Composıtes Suıtable For Three-Dımensıonal Addıtıve Manufacturıng ; İnşaat Yıkıntı Atıkları Kullanılarak Üç Boyutlu Eklemeli İmalata Uygun Jeopolimer Bağlayıcılı Kompozitlerin Geliştirilmesi

Conventional concrete, the main building block of our infrastructure, uses Portland cement (PC) as the main binder, consumption of which is increasing rapidly on a global scale. PC production is significantly energy-inefficient and accounts for up to 9% of total human-driven CO2 emissions worldwide. On the other hand, the construction and demolition waste (CDW) industry is recognized as one of the main sectors contributing to the global solid waste production, constituting 30-40% of total urban waste. Therefore, development of greener binders and proper handling of CDW is of great importance to benefit environment-, social- and economy-wise. In addition, along with the material-related breakthroughs, operation-related breakthroughs utilizing advanced manufacturing technologies need to be made to achieve truly sustainable construction practices. The traditional formwork system in the construction industry requires high cost, workmanship, energy and causes significant waste generation and operational challenges. Thus, three-dimensional additive manufacturing (3D-AM) method can be applied to concrete-like materials as a promising alternative to the existing methods for construction and can contribute to a paradigm shift. This thesis study aims (i) to develop innovative alternative green construction materials by using out of waste materials obtained from construction and demolition activities, and (ii) to merge these developed green materials into 3D-AM for the achievement of truly sustainable construction practices both at the material and operational levels. In that context, to begin with, geopolymer paste mixtures were produced by using CDW-based components with a primary focus on fresh/rheological properties. After that, CDW-based geopolymers were incorporated with CDW-based fine recycled concrete aggregates (FRCA) to obtain geopolymer mortars with fresh properties fitted for 3-dimensional printability. In conclusion, the performance of selected geopolymer mortar mixture with the properties fitted for 3 ...