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. 2019;23(6):128-146. Accessed May 4, 2024. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/187