الفهرس 
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Abstract
1:-Introduction: - A large amount of roads projects is constructed in present time in Egypt, for that this research is seeking to use rigid pavement substitute to flexible pavement because it’s durability, stiffness, and ability to bear high traffic loads and began to used it in Cairo-Suez road in 2015. But the resistant to that it’s high cost, so that the researchers started to get solutions to decrease its cost such as using recycled materials as substitution in concrete composition. Ferrous slags are becoming increasingly popular as re-usable materials to replace conventional rock materials or pozzollanic materials in road building. Using slag aggregate in road construction also presents a potential considerable cost benefit. The price of slag aggregate could cost as little as half that of crushed rock aggregate. In this research we use Basic Oxygen Furnace Slag (BOFS) as a Coarse aggregate and Granulated Slag (GBFS) as a fine aggregate. 2: - Research scope: - Replacement of BOFS instead of Dolomite by 25% ,50%, 75%, and 100%, and replacement of GBFS instead of sand by 25% and 50% .and study the effect of replacement on properties and strengths of Mixtures. 3: - Research objective: The main objective of this research is to study fresh and hardened properties of the concrete which containing different percentages of steel slag as a replacement of coarse aggregate (Dolomite aggregate) and granulated blast furnace slag as a replacement of fine aggregate (sand). The specific objectives are: Determine the optimum percentage of basic oxygen slag to be used as coarse aggregate. Determine the optimum percentage of granulated blast furnace to be used as fine aggregate. Evaluate the effect of using steel slag on the properties of fresh and hardened concrete. Evaluate the effect of using granulated furnace slag on the properties of fresh and hardened concrete. Evaluate the effect of using basic oxygen slag with granulated furnace slag on the properties of fresh and hardened concrete. Evaluate the effect of using steel and blast furnace slag on durability against sulfate salts. 4: - Steps Study : - The tests were divided to three parts. first; tests to study aggregate properties and cement properties such as sieve analysis, specific gravity, Los Angles, and water absorption. second; tests on fresh concrete to calculate its properties and for this we use slump test. third; tests on hardened concrete to study its properties such as compression, tensile, bond, flexible, and the effect of sulfate salts on it properties.5:- Summary of Study:- The results showed that using BOFS and GBFS decrease the workability of concrete but development and improve the mechanical properties of concrete such as ompressive strength, tensile strength, flexural strength, bond strength and GBFS improve durability strength such as sulfate resistance. lanic reaction.