Abstract

Experimental investigations were performed to evaluate the effect of waste Polyethylene Terephthalate (PET) fibres on the mechanical properties of Green Ultra-High Performance Cementitious Composites (GUHPCCs). Ultra-fine Palm Oil Fuel Ash (UPOFA) and Silica Fume (SF) were utilised to produce GUHPCCs that consist of up to 50% UPOFA and 20% SF as a partial replacement binder with cement. PET fibres were added to the GUHPCCs at a proportion of 1% of the total mixed volume, to produce Green Ultra-High Performance PET reinforced Cementitious Composites (GUHPPCCs). The mechanical properties and flexural performance of the resulting beams and slabs, including their stress–strain behaviour and ductility, were investigated. Results showed that addition of PET fibres increases the flexural strength of GUHPPCCs beams by approximately 63.24% compared with that of the ultra-high performance concrete control at the age of 90 days. Moreover, significant improvements in the flexural capacity and ductility index of the GUHPPCCs slabs were obtained. These findings may due to the bridging effects of PET fibres. Thus, the combination of UPOFA and SF with PET fibres can produce GUHPPCCs with superior mechanical properties and enhanced ductility.

摘要

进行了实验研究以评估废弃聚对苯二甲酸乙二醇酯 (PET) 纤维对绿色超高性能水泥复合材料 (GUHPCC) 机械性能的影响。超细棕榈油燃料灰 (UPOFA) 和硅灰 (SF) 用于生产由高达 50% UPOFA 和 20% SF 作为水泥的部分替代粘合剂组成的 GUHPCC。PET 纤维以总混合体积的 1% 的比例添加到 GUHPCCs 中，以生产绿色超高性能 PET 增强水泥复合材料 (GUHPPCCs)。研究了所得梁和板的机械性能和弯曲性能，包括它们的应力-应变行为和延展性。结果表明，添加 PET 纤维可将 GUHPPCC 梁的抗弯强度提高约 63。与90天龄超高性能混凝土对照相比降低24%。此外，获得了 GUHPPCCs 板的抗弯承载力和延展性指数的显着改善。这些发现可能是由于 PET 纤维的架桥效应。因此，UPOFA 和 SF 与 PET 纤维的结合可以生产出具有优异机械性能和增强延展性的 GUHPPCC。