On Thursday the 8th of April 2021, the Faculty of Engineering at Diyala University discussed the student Ibrahim Abbas Ali's master thesis entitled (Structural Performance of unidirectional composite concrete slabs which contains spherical cavities) submitted to the Civil Engineering Department.

Headed by the Minister of Planning prof. Khaled Battal Al-Najm, with the presence of Prof. AbdulMonem Abbas Karim the President of Diyala University, and Prof. Amer Mohamed Ibrahim as the supervisor and membership of: Prof. Rafeh Falih Hassan and Dr. Huda Mohamed Mubarak. The discussion session investigated the Structural Performance of unidirectional composite concrete slabs containing spherical cavities of twelve models of unidirectional composite roofs. The study included working on composite slabs by dividing the used models into four groups depending on the presence and absence of shear connectors, the presence and absence of plastic balls, as well as the dependence on the diameter of the plastic balls (70 mm and 86 mm). Each group consisted of three different shaped iron sheet models, namely the trapezoid shape, the triangle shape and the T shape. The study revealed a number of results, first: The possibility of using other types of iron sheet shapes such as (the triangular shape and the T shape instead of the traditional trapezoidal shape as these shapes showed better results in terms of maximum endurance and structural behavior, as it was found that adding shear conductors to slabs: the trapezoidal shape and a triangular shape increases the maximum load capacity by (22.2% and 17.8%) respectively. Secondly: The composite slabs containing plastic balls in which the ratio of the diameter of the ball to the total thickness of the slab (0.64) gave a maximum endurance comparable to the composite slabs that do not Contain plastic balls.