الفهرس 
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Abstract
1.3 The Objective of the Present Work.
The goal of this research is to perform a feasibility study on Studying the effect of Elevated Temperature on Seawater-mixed FRP reinforced concrete flat slab, in terms of deflection and strength with the following variables:
- The percentage of seawater in the concrete mix.
- The treatment.
- cement type.
1.4 Methodology.
The following process is followed to accomplish this goal:
- Study the behavior of Seawater-mixed FRP reinforced concrete flat slab when exposed to Elevated temperature.
The most important findings of the study: -
1- When the controlled specimen mixed and treated with freshwater is exposed to elevated temperatures, the failure load decreased by 3.8%.
2- Samples mixed with seawater by 50% and 100% that are exposed to the same temperature have decreased their failure load by 8.76% and 18.3% respectively compared to the control sample.
3- The high temperature effect on samples containing 50% seawater in the mix and seawater treatment, the high temperature effect can be neglected, whether in the case of the use of ordinary Portland cement or sulfate resistant cement
4- The use of sulfate-resistant cement with seawater concrete had no effect on elevated temperature resistance, as the failure load was reduced by 9.8%.
5- In the case of the use of seawater in mixing and treating, the effect of elevated temperature was clear as the failure load decreased by 8.8%.
6- The number of cracks increases with the increase in the proportion of seawater in the mix or treated when the samples are exposed to elevated temperatures. The cracks shape was parallel to the reinforcement bars. The reason for the appearance of this shape is that the temperature causes the appearance of very small cracks in the areas of connection of fiber bars with concrete.
7- The use of sulfate-resistant cement was instrumental in reducing the number of cracks that appeared due to the exposure of the slab to elevated temperature. The use of sulfate-resistant cement has also reduced the width of the cracks.
8- When using seawater in mixing by 50% and 100% and treating with fresh water, the impact of high temperature on deflection was positive, as deflection improved by 7.47% and 35% for both 50% and 100% respectively.
9- The effect of elevated temperature on the samples that were mixed and treated with seawater, with the use of sulfate-resistant cement was less harmful, as sulfate-resistant cement reduced deflection by 8.6% and 20.9% for the percentage of seawater in the mix was 50% and 100% respectively.
10- The energy absorption decreases in the samples exposed to elevated temperature with the increase in the proportion of seawater in the concrete mixture 0%, 50% and 100%, the ratios were as follows: 8.65 % 26.1% 55.1%, respectively.