الفهرس 
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Abstract
Steel slag is a non-decaying by-product waste material generated during steel making industry in electric arc furnaces. It may be engineered for use as an aggregate in concrete or asphalt mixes for construction of civil/military structures and roads. In this research, steel slag was used as a replacement of coarse aggregate to produce normal and high strength concrete. Two groups of concrete mixtures comprise 22 mixtures with electric arc furnace steel slag (EAFSS) replacement percentages of 0%, 25%, 50%, 75%, and 100% by weight of coarse aggregate, various cement contents (350 kg/m³, 400 kg/m³, 500 kg/m³, 600 kg/m³) and two types of pozzolanic materials (silica fume, SF, and steel slag powder, SSP, 20% from cement weight for both) were investigated. For these mixes, the effects of the used steel slag replacement ratio, cement content, and pozzolanic material type and content on the fresh and hardened concrete properties were investigated through a comprehensive laboratory testing program. The tests conducted on fresh concrete were slump cone and Vee-Bee tests. For the hardened concrete, the conducted tests were, compression, indirect tension, bond, flexural strength, modulus of elasticity, permeability, and thermal conductivity. Testing results showed that, the steel slag concrete properties were generally superior to the conventional concrete. The optimum steel slag percentage was found to be 50%. Results also showed that it is possible to produce high strength concrete with compressive strength more than 100 MPa using EAFSS. Finally, the field performance of steel slag concrete as a Jointed Plain Concrete Pavement (JPCP) was predicted using the Mechanistic-Empirical Pavement Design Guide (MEPDG) software. A pavement section with the same traffic level and two different climatic conditions (Cairo and Alexandria) was used for the simulation runs. The results of the computer simulation runs revealed improved performance hence longer service life of the steel slag concrete compared to the conventional natural aggregate concrete.