The performance of various fibers as a reinforcement in cementitious composites has been studied by many researchers. The point of paramount importance is that cement-based materials are highly alkaline environment. Polyethylene terephthalate (PET) as a man-made fibers in alkaline environment can be subjected to degradation. The available information on stability of PET fibers in cement-based materials is insufficient and inconsistent. Although some researches have rejected the use of these fibers as a suitable reinforcing element in cementitious composites, there are others that have positively advocated the use of such fibers in concretes. This review paper aims to thoroughly investigate the performance of PET fibers in alkaline environment of cementitious composites. Thus chemical degradation of PET fibers and their subsequent behavior when used in alkaline environment of cementitious composites is well documented. The paper encompasses an up to date critical evaluation of the so far conducted research works and additional future research requirements in this field. The overall conclusion that can be drawn is related to the fact that, despite degradation of the added PET fibers, in most applications properties of the cementitious composites can be enhanced. This phenomenon can be attributed to improvement resulted from other properties of the PET fibers in alkaline environment.

许多研究人员已经研究了各种纤维在水泥基复合材料中作为增强材料的性能。最重要的一点是水泥基材料是高度碱性的环境。聚对苯二甲酸乙二酯（PET）在碱性环境下作为人造纤维可能会降解。有关水泥基材料中PET纤维稳定性的可用信息不足且不一致。尽管一些研究已经拒绝将这些纤维用作水泥复合材料中的合适增强元素，但仍有其他一些研究积极倡导在混凝土中使用此类纤维。本文旨在彻底研究PET纤维在水泥基复合材料碱性环境中的性能。因此，当在水泥基复合材料的碱性环境下使用时，PET纤维的化学降解及其后续行为已得到充分证明。本文包含了对迄今为止进行的研究工作以及该领域其他未来研究要求的最新评估。可以得出的总体结论与以下事实有关：尽管添加的PET纤维降解，但在大多数应用中可以提高水泥复合材料的性能。该现象可归因于在碱性环境中由PET纤维的其他性能导致的改善。可以得出的总体结论与以下事实有关：尽管添加的PET纤维降解，但在大多数应用中可以提高水泥复合材料的性能。该现象可归因于在碱性环境中由PET纤维的其他性能导致的改善。可以得出的总体结论与以下事实有关：尽管添加的PET纤维降解，但在大多数应用中可以提高水泥复合材料的性能。该现象可归因于在碱性环境中由PET纤维的其他性能导致的改善。