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TEMPERATURE BEHAVIOR AND HYDRATION PROCESS OF SELF-COMPACTING CEMENT AND MORTAR MIXTURES USING KOSOVO LIGNITE FLY ASH AS ADDITIVE
Abstract
Lignite and other types of coal are formed as result of different chemical and biological transformations of ligneous and plant materials lacking oxygen. During the coal use for energy production , there are mineralogical remains in the form of ashes, which have different physical, chemical, mineralogical and morphological properties, which largely depend on the type of coal used, and technology in its combustion. This type of ashes is presented in thermal power plants in the form of dust or fly ash and inorganic remains, which are separated from the process by different methods. These ash remains are usually divided in two groups or classes, depending from their chemical structure, and here the content of calcium is specifically important. The ash with a high presence of Si and a relatively low content of Ca pertains to the F class, while the ash with a high content of Ca pertains to the C Class. Fly Ashes analyzed in Kosovo TPP-s pertain to F Class. Benefits from the use of these remnants as increment is not only important for the positive impact in material attributes where it is used, but there are also other impacts of a specific importance. Thus, we believe that the key benefits can be divided into: Engineering benefits – in this case, the majority of engineering attributes in materials are positively affected by ash increments and other puzolanic materials will be largely explained in the course of this paper. Economic benefit –Hence, finding the possibility for using remnant materials to partially substitute to a certain extant the lacing materials as cement is, would directly impact on reducing energy expenses and energy production expenses. Ecological benefit –Considering problems that Kosovo has with the deposit of very large amounts of ash remnants, we thought that studies and analysis of possibility of using lignite ashes in other branches of industry would be of a specific importance and would have positive impacts in reducing cost, reducing the environmental pollution extent, and saving energy. For the fly ash utilization from great importance is the behavior of temperature hydration by mixture of fly ash in utilization process for cement and mortar production and this is the main point that will be explained during this work.
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