الفهرس 
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Abstract
Electric arc furnace steel slag is produced during the oxidation of steel pellets in an electric arc furnace. This product can be used as small aggregates in asphalt and concrete. In this research, steel slag was used as a replacement of aggregates for producing high strength and ultra-high strength concrete. The main objective of this research is to investigate the effect of utilizing steel slag as coarse aggregate, cement content and silica fume on the concrete behavior such as; the volume weight, compressive strength, flexural strength, indirect tensile strength, abrasion resistance, corrosion resistance and effect of exposure to elevated temperatures. This investigation was carried out on three main groups of a total 36 mixes that having cement content equal to 350 kg/m3 , 450 kg/m3 and 550 kg/m3 . Silica fume was added by 20% of cement content, replacement percentages of electric arc furnace steel slag equal to 0%, 20%, 40%, 60%, 80% and 100%. Test specimens were subjected to elevated temperatures up to 800oC for 2hours. Specimens were exposed to sever sulfate attack through drying-wetting cycles in sodium sulfate solution with concentrations of 5% and 10% for one-year period. also, Twenty cylindrical specimens with diameter equal to 50 mm and a height of 200 mm were prepared and had been immerged in NaCl solution with 3.5% concentration. Subsequently, the electrochemical behavior of the specimens was assessed using linear polarization resistance technique (LPR) and open circuit voltage (OCV). The results indicated that rebar in the concrete specimens that containing steel slag was found to be resisting corrosion efficiently better than the control specimens which incorporates dolomite as coarse aggregate. The results indicated that utilizing 80% steel slag as coarse aggregate replacement achieved the highest compressive strength, while 100% steel slag replacement enhanced sulfate attack resistance. The results also revealed an enhancement of the residual strength of concrete specimens incorporating up to 100% steel slag for all levels of elevated temperatures up to 800oC.