الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Many environmental problems are due to agricultural and industrial waste. Millions of tons of agricultural and industrial waste, such as bananas, palm trees, lathe products such as Teflon (polytetrafluoroethylene), and mineral waste are produced all over the world. On the other hand, the main problem of high strength concrete (HSC) is the sudden failure in the final capacity of concrete, According to Egypt’s vision 2030 in the search for more sustainable and environmentally friendly materials, the study objectives were set to solve these problems by studying the mechanical, chemical and natural properties of natural and industrial wastes through their recycling and treatment for use as fibers in highly resistant concrete. Study the effects of natural and industrial waste fibers to improve HSC’s brittle behavior. Study the behavior of high resistance beams using natural and synthetic ropes. The natural fibers were treated with chemical solutions before being recycled into the concrete. Thirteen HSC blends are designed; Six mixes of natural fibers, three mixes contain banana fibers (BF), while the other three contain palm frond sheath fibers (PLSF), and six mixes of synthetic fibers, three of which contain Teflon fiber (PTF), while the other three contain mineral waste fibers (MWF), and the latter was a control mix. The fiber mixing ratios of were 1%, 2%, and 3% of the mix volume, and the aspect ratio was 100. Fresh and hardened properties, such as stagnation, compression, tensile, bending strength, and modulus of elasticity, besides, microstructure analysis was performed. For natural fibers and HSC with natural fibers by electron microscopy. Besides, the M2% -PLSF mixture was used in the design and testing of five HSC beams with a cross-section of 150 mm, a height of 200 mm, and a length of 1800 mm, two with natural ropes (BR, PLSR), two with industrial ropes (PPR, PETR) and a control beam. Natural and synthetic ropes have the same diameter of 12 mm and have been partially replaced by one-third of the main steel. The behavior of the concrete beams was measured by measuring the bending strength, marbling in the middle of samples, toughness, and collapse shape. No significant improvement was observed in the compressive strength of vi the natural fibers. The tensile strength of the highly resistant concrete was increased with the application of 1% and 2% of PLSF. Compared with other types of fibers used, the use of PLSF fibers resulted in a higher improvement in the properties of high strength concrete. Natural and synthetic fibers showed improved efficiency in enhancing the shelling behavior of high resistance concrete; Beams containing natural or synthetic ropes showed a decrease in crack loads with more marbling than the control beam, and the use of natural and synthetic fiber ropes showed a decrease in strength, and an increase in crack thickness when using natural ropes more than artificial ropes. The type of collapse of all tested beams was recorded as collapse in bending.