Graduate School of Science and Engineering
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Master ThesisPublication Metadata only Experimental and analytical study on the performance of cementitious mixes containing different re-generated end of life materialsMahmoudi, Matineh; Bundur, Zeynep Başaran; Bundur, Zeynep Başaran; Çinicioğlu, Safiye Feyza; Gülgün, M. A.; Department of Civil EngineeringCement, which is one of the main constituents of conventional concrete, is being manufactured every day around the world. because of the large demand for the material, the industry is responsible for 8% of the total global man-made CO2 emission [1]. Thus, environmental considerations motivated researchers to find alternative replacements for cement in concrete that can reduce the harmful impacts of the concrete industry. Calcined clays are one group of Supplementary Cementitious Materials (SCMs); among them, metakaolin is the most reactive SCM recognized up to now [2]. However, due to its limited resources and uses in other industries, it has a relatively high price and it is not feasible to use it as a cement substitution in larger volumes. Therefore, treating and activating other potential materials in order to obtain an active cement replacement is the interest of many research projects nowadays. Due to their high alumina and silica content, concrete demolition waste and mineral demolition deposit quarries can be suitable SCM candidates for cementitious systems. When these raw materials and End of Life (EOL) products (such as marble dust from quarries) are used directly, they are not chemically involved in the hydration processes needed for the setting and hardening of concrete and only act as a filler. However, appropriate mechanical and thermal activation procedures can destabilize the pozzolanic-active phases in EOL materials, might contribute to the hydration reactions, and replace a considerable portion of OPC. Nevertheless, there is a knowledge gap in experimentally activating the EOL materials and investigating their effects on cementitious systems when included at high percentages. Thus, this study aims at understanding the performance of cementitious mixes containing regenerated EOL materials as SCMs up to 30% replacements. The influence of regenerated EOL materials was measured by fresh and hardened state tests, as well as durability assessments. The results showed that there was a general decrease in the workability and strength of EOL-containing samples, while the other results varied from one material to another. The experimental results were further used for generating analytical estimation models. The outcomes of this study will enable utilization of EOL materials which would decrease the environmental problems of landfill accumulation. This will also create economic value for these large amounts of waste material that previously had zero value, as well as decreasing energy consumption, CO2 emission, and the raw material costs of cement production. All of these factors contribute to the Horizon Europe targets in the European Energy Sustainability Initiative.