University of Fallujah

About: University of Fallujah is a education organization based out in Baghdad, Iraq. It is known for research contribution in the topics: Compressive strength & HOMO/LUMO. The organization has 117 authors who have published 113 publications receiving 435 citations.

Use of recycled fibers in concrete composites: A systematic comprehensive review

Abstract: Municipal solid waste materials are growing worldwide due to human consumption. Nowadays, a different type of goods on large-scale is produced in the factories which is going to generate numerous amount of solid waste materials in the near future. Therefore, the management of these solid waste materials is a great concern around the world. Inadequate landfill, environmental pollution and its financial burden on relevant authorities, recycling and utilization of waste materials have a significant impact compared to disposing them. Studies have been done to reuse of waste materials as one of the elements of concrete composites. Each of the elements gives the concrete strength; however, the reuse of these wastes not only makes the concrete economical and sustainable, but also helps in decreasing environmental pollution. There are a number of different types of waste materials such as plastics, carpets, steels, tires, glass, and several types of ashes. In this paper, a comprehensive review was carried out on the influence of recycled plastic fibers (RPFs), recycled carpet fibers (RCFs) and recycled steel fibers (RSFs) on the fresh, mechanical and ductility properties of concrete. The previous studies were investigated to highlight the effects of these waste product fibers on the most important concrete properties such as slump, compressive strength, splitting tensile strength, flexural strength, modulus of elasticity, ultrasonic pulse velocity, energy absorption, ductility, and toughness. In this regard, more than 200 published papers were collected, and then the methods of preparation and properties of these recycled fibers (RF) were reviewed and analyzed. Moreover, empirical models using mechanical properties were also developed. As a result, RPFs, RCFs and RSFs could be used safely in concrete composites due to it is satisfactory fresh, physical and mechanical properties.

Examining the impact of ethical leadership and organizational justice on employees’ ethical behavior: Does person–organization fit play a role?

Abstract: Leadership studies on corporate ethical behavior and practices have grown considerably, contributing significant knowledge on ethical leadership challenges that are organizational and industry focu...

Properties of environmental concrete that contains crushed walnut shell as partial replacement for aggregates

Abstract: Concrete production consumes a large amount of fine and coarse aggregates. Therefore, eliminating or reducing the consumption of aggregates in concrete can produce environment-friendly building materials. Considerable research has confirmed that the use of waste materials in concrete addresses the high utilisation of raw materials. Walnut is a common farming product in the north of Iraq. A substantial amount of walnut shells is disposed of in landfills. In the present work, crushed walnut shells (CWS) were selected as partial substitute for coarse and fine aggregates at ratios of 5 to 25% with an increment of 5%. The experimental work was divided into three parts. Firstly, fine aggregates were replaced with CWS at the preceding ratios. Secondly, coarse aggregates were substituted with CWS at the aforementioned ratios. Thirdly, fine and coarse aggregates were replaced by CWS at the same proportions. Absorption ratio, compressive strength, flexural strength, splitting strength and dry density were determined at 28 days for all the mixtures and the control sample. Results showed that all tested properties, except absorption ratio, decreased when CWS was used. Optimal results were achieved when fine and coarse aggregates were replaced together with CWS. Advantageous values were obtained with a 15% CWS replacement for both types of aggregates.