A study conducted by [PERSON] et al. [27] revealed that the addition of 1.5% PA fibers to concrete enhanced its capillary and water absorption properties. Alternatively, concrete without cement is a relatively new technology that has been introduced to provide environmental benefits. This process involves fully replacing Portland cement with an alumina-silicate material that contains alkaline reagents to improve concrete properties. The demand for cement shares a directly proportional relationship with economic growth due to the need for infrastructure development, leading to an increase in cement production [28]. The manufacturing of cement is a significant source of air pollution, and in 2007, it was reported that cement production was responsible for 5% of total greenhouse gas emissions [29]. Given these reasons, it is essential to identify eco-friendly alternatives to cement that can help mitigate the environmental impact of cement production and prevent environmental degradation [30; 31; 32; 33]. The substitution of cement with supplementary cementitious materials (SCMs), such as fly ash, silica fume [34; 35; 36], slag, limestone fines [37; 38; 39] and others, has been proposed as an effective solution for reducing the environmental impact of concrete production [40; 41; 42; 43]. Numerous studies have explored the use of SCMs in concrete, including the use of waste glass as a replacement for cement [44; 45; 46]. However, recent research by [PERSON] et al. [47] has revealed that the use of cathode-ray tube (CRT) glass in concrete may reduce its compressive strength. Conversely, [PERSON] et al. [48] reported that concrete containing 10% CRT glass had increased elastic modulus, compressive strength, and flexural strength. Several additional properties of CRT glass concrete have also been investigated. The addition of CRT glass to concrete has been found to decrease drying shrinkage, as CRT glass particles absorb less water [49; 50; 51]. However, the addition of CRT glass to concrete has also been found to increase expansion values by minimizing resistance to the alkali-silica reaction (ASR) [52; 53]. The structural performance of strengthened concrete beams incorporating glass waste has been studied by various researchers. [PERSON] et al. [54] investigated the structural capacity of reinforced concrete beams incorporating waste glass powder as a cement replacement up to 15% and found that the reference beams' load capacity was lower for beams containing 10% and 15% waste glass, respectively. Another study found a reduction in the flexural strength and ductility factor of strengthened concrete beams when glass was used as fine particles or coarse aggregates [55]. Recent research has provided evidence to suggest that natural fibers could serve as a sustainable substitute for traditional synthetic fibers in concrete, with some studies indicating that their incorporation could enhance the strength and durability of concrete [56; 57; 58]. However, the feasibility of using natural fibers in concrete production on a larger scale requires further research. Notably, the use of fibers derived from the Phragmites australis plant as reinforcement in concrete is still an emerging area of investigation. Hence, the objective of the present study is to investigate the effect of incorporating waste glass as a cement replacement with natural fibers from the Phragmites Australis plant on the performance of reinforced concrete (RC) beams. The mechanical properties of concrete, such as compressive strength, ultrasonic pulse velocity (UPV), split tensile strength, and flexural strength, will be examined. The structural performance of RC beams incorporating Phragmites Australis fibers and waste glass will also be investigated. These results will be used to provide recommendations for practicing engineers and future research.