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Omar, O. , Heniegal, A. , Elhameed, G. , Mohamadien, H.. "Effect of Local Steel Slag as a Coarse Aggregate on Properties of Fly Ash Based-Geopolymer Concrete". World Academy of Science, Engineering and Technology, Open Science Index 107, International Journal of Civil and Environmental Engineering, (2015), 9(11), 1464 - 1472.