Investigation of the effect of dolomite on sodium carbonate activated slag based systems

Due to the high amount of CO2 emissions released by Portland cement, one of the most important components of concrete, today's studies have focused on the search for alternative binder materials. With the development of technology, it has gained importance to propose environmentally friendly new materials instead of cement, which is the main binder of concrete. Recently, alkali-activated materials have been the focus of many researchers to achieve this goal. It is possible to reuse waste materials, which cannot be recycled and whose storage in nature is harmful in the long term, as additives. Another option is to use materials such as slag and fly ash as the main binder and to be activated with alkalis. Within this concept, the most valid applications are the activation of fly ash and blast furnace slag with alkalis. In this thesis, it is aimed to produce one-part sodium carbonate-activated calcined dolomite and blast furnace slag-based systems, which are prepared by dry mixing of binders and activator without preparing an alkaline solution and then adding water. In addition, nano-silica was added to alkali-activated slag/calcined dolomite systems, and compressive strength developments and microstructure properties were investigated. By replacing the blast furnace slag with calcined dolomite at the rate of 5-20%, setting time, flow diameter, compressive strength, shrinkage and microstructure analyzes were made and these ratios were compared and examined. Keywords: Alkali activated materials, Compressive strength, Calcined dolomite, Nano silica, Microstructure.