Browsing by Author "Alithawi, Marvan"

Now showing 1 - 3 of 3

Mechanical and Physical Properties of Glass Fiber and Fly Ash Added Cement Bonded Composites
(2021) Alithawi, Marvan; Akın, Arife
In this study, the changes in the mechanical and physical properties of cement-bonded composites containing fly ash with different characters at high and low rates were investigated with varying proportions of glass fiber reinforcement. F and C class fly ash was added to the mixture in varying proportions (10%, 20%, 50%, 60%) by cement replacement method. In addition, 16 different mixtures containing fly ash were obtained by including glass fiber in two different ratios (10%, 20%).For control, fly ash was not used in the reference samples, and two different reference mixtures were prepared with two different fiber ratios. As a result of the experiments, it was observed that the strength properties were higher in the samples containing Class C fly ash. Depending on the changing glass fiber ratio, as the fiber ratio increased, an increase was observed in flexural strength, while a decrease incompressive strength was observed. In the permeability tests including water absorption tests, it was observed that the samples containing Class F fly ash generally gave better results than the samples containing Class C fly ash. In addition, the increase in permeability values due to the increase in the glass fiber ratio is among the results obtained.
Use of F Type Fly Ash in Cement Mortar With Alternative Mixing Methods
(2021) Akın, Arife; Alithawi, Marvan
In this study, it is focused on the use of fly ash, which is one of the industrial wastes, as a partial replacement of cement and fine aggregate in cement mortar. The feasibility of using fly ash as an alternative to cement and fine aggregates in concrete was determined by examining its effect on strength and durability properties in composites. Fly ash was used in the mixtures with three different mixing methods. These is the simple substitution method, addition method and the partial substitution method. In each method, 10%, 20% and 30% of the material was removed by weight, and a total of ten different mixtures were prepared by adding fly ash instead. As a result of the experiments to determine the properties of the mixtures in fresh and hardened state, the inclusion of fly ash in the mixtures improved the workability, freeze-thaw resistance, water absorption and capillary water absorption rate increased with the increase of the fly ash content. The results obtained in terms of the methods used in the study; in the pressure, water absorption and capillary water absorption experiments, the addition method gave better results than the other methods, and according to the bending and cylinder splitting test results, the mixtures prepared with the partial substitution method were found to be higher than the other mixing methods.
Use of F-Type Fly Ash in Cement Mortar With Alternative Mixing Methods
(2022) Akın, Arife; Alithawi, Marvan
In this study, it is focused on the use of fly ash, which is one of the industrial wastes, as a partial replacement of cement and fine aggregate in cement mortar. The feasibility of using fly ash as an alternative to cement and fine aggregates in concrete was determined by examining its effect on strength and durability properties in composites. Fly ash was used in the mixtures with three different mixing methods. This is the simple substitution method, addition method and partial substitution method. In each method, 10%, 20% and 30% of the material was removed by weight, and a total of ten different mixtures were prepared by adding fly ash instead. As a result of the experiments to determine the properties of the mixtures in the fresh and hardened state, the addition of fly ash to the mixtures improved the workability and freezethaw resistance. When we look at the results in terms of the methods used in the study, it was seen that the addition method gave better results in pressure, water absorption and capillary water absorption experiments than other methods, and according to the bending and cylinder splitting test results, higher values were obtained in the mixtures prepared with the partial substitution method compared to the other mixing methods.