【摘要】 先选择适宜的养护条件，再对比研究了掺入不同纤维对UHPC抗压强度、弹性模量、弯曲性能、冲击性能、劈裂抗拉强度的影响。结果表明：90℃蒸汽养护3 d为研究较优养护方式，单掺聚甲醛（POM）纤维会导致UHPC抗压强度降低，在较优养护方式下，各组UHPC抗压强度约为120 MPa，较未掺组降低了约9%。但掺入POM纤维能明显提升UHPC的弯曲性能、冲击性能及劈裂抗拉强度，当POM纤维直径为0.2 mm，长度为18 mm时，UHPC的抗冲击性能最好，延性系数为0.94，劈裂抗拉强度最高，达到14.80 MPa。更多还原

【Abstract】 Ssuitable curing conditions were first selected,and then comparisons were made on the impact of incorporating different fibers on the compressive strength,elastic modulus,flexural properties,impact resistance,and splitting tensile strength of UHPC. The results show that steam curing at 90 °C for 3 days was the optimal curing method for this experiment. Incorporating only POM fibers led to a decrease in the compressive strength of UHPC;under the optimal curing condition,the compressive strength of each group of UHPC was approximately 120 MPa,which is about 9% lower compared to the non-incorporated group. However,adding POM fibers significantly improved the flexural properties,impact resistance,and splitting tensile strength of UHPC. When the POM fiber diameter was 0.2 mm and length was 18 mm,the impact resistance reached highest levels,with a ductility coefficient of 0.94 and the highest splitting tensile strength, reaching 14.80 MPa.更多还原