الفهرس 
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Abstract
As widely known, concrete in its wide meaning is considered to be the most widely used construction material due to availability of its ingredients with economical value compared to other competent of building materials.
Cement is the most important and expensive material in concrete and its manufacture involves use of raw materials and energy. Thus, replacement of cement by less expensive materials partially or in full would reduce the cost of construction and simultaneously conserve energy and resources. Replacement is especially effective when the material substituting for cement happens to be a waste material or a by-product of another industry. Steel making slag is produced as a by-product during the process of the conversion of pig-iron and scrap to steel. The steel making slag was reported to have limited applications in road making, concrete aggregates and in land fill.
In Egypt, the numerous iron and steel making companies, suffer the accumulation of slag. However, only the Helwan Iron and steel company uses the blast furnace slag in cement manufacture.
In Alexandria, the Alexandria Nation for Steel and Iron company suffers from the accumulation of steel making slag (500 ton/day) expected to reach (700 ton/day) in 1997.
This research studied the usage of steel making slag from Alexandria National for Steel and Iron company as a ground material finer than size 475um in concrete as a partial replacement for cement. The percentages of cement replacement with ground steel making slag in cement paste and mortar were 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 by weight, while in cement Concrete were 0 and 30 by volume.