The Master’s Thesis was discussed in the Faculty of Engineering, University of Kufa, entitled: “Punching Shear Strength Improvement of Flat Slab Using Polypropylene Fibers” for the student Nabaa Ismail Hasan.
The discussion was attended by the Dean of the Faculty, Assistant Professor Dr. Hasan Mahdi Al-Khateeb, who offered sincere thanks and appreciation to the discussion committee, as president and members, and challenged them under the circumstances of the Corona pandemic to complete the discussions of postgraduate studies in the faculty, congratulating the student for accomplishing her mission and wishing success to all. The discussion committee is chaired by Prof. Dr. Adel Abdul Amir from the Faculty of Engineering at Nahrain University, while its membership included both Assistant Professor Dr. Hayder Wafi Ali and Assistant Professor Dr. Haider Hamad Abd in addition to the membership and supervision of Assistant Professor Dr. Haider Hassan Saleh Al-Khodari from the Faculty of Engineering at the University of Kufa.
The supervisor of the thesis, Assistant Professor Dr. Haider Hussain Salih Al-Khudary, said: The purpose of this research is to study the effect of polypropylene fibers on the structural behavior of piercing shear resistance, while the optimal percentage added to polypropylene fibers was determined during the test for the experimental and numerical program. He explained that the research included testing twelve panels with dimensions (1000 x 1000) mm and thickness of 100 mm.
The researcher indicated that the panels were tested by subjecting them to a concentrated load in the middle of the models. The steel bearing plates were placed over the supports and the bearing below the point to prevent site failure. Some tests (cubes, cylinders, and prisms) were conducted to study the mechanical properties of polypropylene fiber concrete such as compressive strength, tensile strength to split, and fracture modulus. Parameters studied in this paper include the content of polypropylene fibers and the value of compressive strength.
The experimental results showed that the optimum percentage of polypropylene fibers was 1% of the weight of the cement, as the compressive strength increased by 34%, 19%, and 23% for groups A, B, and C, respectively. As for the split tensile strength, it increased by about 34% for group A when adding 2% of polypropylene fibers. While Group B and C, the split tensile strength increased by 23% and 31%, respectively, when adding 3% polypropylene fibers. For group B and C, the fracture modulus increased by 10% and 22%, respectively, at a rate of 1%, while for the group (A), the optimum value to add polypropylene fibers was 2% as the fracture modulus increased by 21%. The results also showed that the final carrying capacity obtained from examining the models was carried out in a similar mechanism to resist compression of the cubes with an increase in the percentage of polypropylene fibers.
After the discussion and the student defended, the committee decided to grant her a master’s degree in civil engineering.