Omar, O. , Heniegal, A. , Elhameed, G. , Mohamadien, H. (2015), '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, 9(11), 1464 - 1472.