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    Influnce of internal sulfate effect on high strenght concretes in terms of qulity mangement
    (İstanbul Gedik Üniversitesi, 2021) Aljomaily, Mays Ahmed Majeed; Kazar, Gökhan
    The use of high-strength concrete has received much attention recently; Because the use of high strength concrete reduces the concrete sectors and thus provides more space within the facilities, reduces the weight of the structure, and allows an increase in the number of floors, while also distinguished by its high durability, with time. The effect of sulfates entering concrete is one of the most important technical problems facing concrete industries, which negatively affects the quality of the technical properties of concrete, as the internal sulfate attack leads to a large expansion in concrete, which leads to a decrease in the compressive resistance, which causes damage to concrete structures, especially those used in bridges. And giant concrete structures In this study, the effect of the attack of external sulfur salts on concrete was evaluated by following the changes in the compressive strength of concrete models that are fully and continuously immersed during the immersion period in different sulfate solutions, Magnesium sulfate MgSO4, Sodium sulfate Na2SO4 and Calcium sulfate CaSO4 separately, with different concentrations and different ages. also, the effect of internal sulfate on the quality of high-strength concrete was highlighted by studying its effect on the quality of materials entering the formation of high-resistance concrete, namely (gravel, sand, and cement). The results showed that the resistance to compression and direct and indirect tensile strength decreases in the presence of a percentage of sulfate salts in the concrete mixtures, and it exhibits the same behavior accordingly. Also, the total content of the effective sulfur salts may have a better positive effect than the total sulfate content because of its dependence on the size of the grains of the material used. The study also found that the use of quality tools has a positive and effective effect in improving the properties of high-resistance concrete by diagnosing the main problems of concrete and identifying the sub-causes leading to those problems and then developing appropriate solutions to address them, all through the Diamond cycle and its sub-tools represented by the classic quality tools. the study recommended The use of sulfate-strength cement, a type of Portland cement, where the amount of tri-calcium aluminate is limited to less than 5% and the oxides of calcium, silicon, and various minerals are less than 25%, which reduces the formation of sulfate salts, at which time the possibility of sulfate attack on concrete is reduced. As recommended by the study Relying on the DAMAC work team for the purpose of continuing to follow up on quality according to its different stages and giving him the time necessary for that for his high ability to diagnose and treat deviations.