Investigate the influence of Aspect Ratio of Copper Fiber on the improvement of pure gypsum’s compressive strengthEsraa Kamal Jaafar, Hamid Abdulmahdi Faris, Firas Saeed Abbas and Ahmed S.D. AL-RidhaE3S Web of Conf., 559 (2024) 04013DOI: https://doi.org/10.1051/e3sconf/202455904013