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IMPROVING SHEAR STRENGTH OF THICK HOLLOW CORE SLABS BY USING LIGHTWEIGHT HIGH STRENGTH CONCRETE PRODUCED FROM RECYCLED CRUSHED CLAY BRICK AND IRON POWDER WASTE. J. eng. sustain. dev. [Internet]. 2019 Nov. 1 [cited 2024 May 4];23(6):128-46. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/187