| dc.description.abstract | Geopolymer concretes are studies to reduce the use of cement and conventional concrete. These studies, which are widespread today, are of great importance in terms of the development of new generation binders. Thanks to the production of cement-free geopolymers, will ocur reductions in CO2 emissions. In addition, with the use of artificial pozzolans, positive effects can be achieved on environmental protection, recycling of waste materials and sustainability. One of the most important problems in the production of geopolymer concrete is workability. Workability plays a key role in the production, placement and compaction of mortars or types of concrete. If a concrete with difficult workability cannot be properly placed in the mold and compressed, the durability of the concrete will be adversely affected by this situation. The strength values will remain at low levels if the mortar and concrete voids are more than normal, and if sufficient compression cannot be made during the placing of the mold. In this study, light geopolymer composites will be produced by using expanded perlite as aggregate, blast furnace slag (YFC) as binder, and raw perlite powder (powder perlite) brought to the cement fineness size in different proportions. In the study, the production of lightweight geopolymer composite will be done with a fixed molarity value. Sodium hydroxide (NaOH) solution will be used as the activator. In the production of lightweight geopolymer composites, preliminary studies will be carried out on the curing temperature and curing times, and work will continue on the optimum values obtained. Sand and aggregate form the skeletons of mortars and concretes. Approximately 70% to 85% of mortar and concrete consists of sand and aggregates. When the concretes are examined according to their weights in the literature, it is seen that they are classified as light concrete, normal concrete and heavy concrete. Here, the most important element that makes the concrete light, normal or heavy is aggregate. In this study, expanded perlite will be used as aggregate, which is obtained from the factory as an approximate maximum grain diameter of dmax≌ 4.75 mm after the expansion process. In addition, 3% by volume (8mm in size) fiber will be used in the base part to improve the flexural strength of lightweight geopolymer composites, and 0.5% by volume (4mm in size) will be used in the mixture to prevent the formation of shrinkage cracks and increase the compressive strength. Concrete, cement mortar, composite... etc. One of the important features that enable to make comments and make decisions about the samples produced as For this reason, flexural and compressive strength analyzes of geopolymer mortars and fibrous/non-fibrous lightweight geopolymer composites will be performed. According to the results of this analysis, three designs that give the best results in geopolymer mortars and fibrous/non-fibrous lightweight geopolymer composite sample groups will be selected; These three designs will be reproduced with magnetized water obtained at different magnetic field and flow velocity values, and the stage of improving their mechanical and insulation properties will be started. For this purpose, the water to be used in the production of geopolymer mortars and fibrous/non-fibrous geopolymer composites that give the best three results will be converted into magnetized water by passing through the device designed to apply different magnetic fields at different flow rates. Magnetized water field constant 600 millitesla (mT) and 1000 mT (0.6T (Tesla) and 1.0T); flow rate will be 9 liters/minute (lt/min) and 18 liters/minute. Thermal conductivity, mercury porosimetry, SEM, EDS, XRD, FTIR analyzes will be made for the mixtures obtained by using magnetized water. As a result, in this proposed project, it is aimed to produce a material with a low thermal insulation coefficient. One of the most important elements in the production of lightweight geopolymer is to bring the workability and mechanical strength to the desired level. It is aimed to improve the workability and mechanical properties by using magnetized water in the light geopolymer mixture. In addition, it will be possible to reduce the dead loads of the structures with the production of lightweight composite materials. Thus, the self-loads of the existing elements in the building will decrease and it will be possible to reduce the effects of the earthquake on the structure. Thanks to the use of perlite as aggregate, a new area of use will be created for the perlite reserves in Turkey. In the study, it is aimed to produce lightweight composite materials with alternative binders to cement-binding materials by using YFC and powder perlite. In addition to these, it is aimed to reduce carbon dioxide (CO2) emissions, energy consumption from cement production and the negative effects on the environment due to these situations. | en_US |
