摘   要：研究了玄武岩纤维（BF）、聚丙烯纤维（PP）和钢纤维（SF）对免蒸养PHC大口径管桩混凝土的工作性能、力学性能及抗冲击性能的影响。结果表明，在保证坍落度的条件下，BF和PP的掺入导致基准配比总用水量的增加，SF的掺入对基准配比总用水量影响不大；掺入 BF和PP的混凝土因用水量的增加导致抗压抗折强度随着纤维掺量增加而降低，均低于空白组，而掺入SF的混凝土抗压抗折强度随着纤维掺量增加而增加，高于空白组；落球冲击试验结果表明，纤维的掺入提高了混凝土板单次冲击过程中弯曲荷载，降低了冲击过程中板的挠度；掺入SF的混凝土具有最高的重复落球冲击次数，掺入PP的混凝土抗冲击次数也略高于空白组，掺入BF的混凝土板承受的重复冲击次数仅略高于未掺纤维的空白组。

Abstract：The workability, mechanical properties and impact resistance of concrete forthe non-steam cured large-diameter PHC pile with basalt fiber (BF), polypropylene fiber (PP) and steel fiber (SF), respectively, were investigated. The results show that the incorporation of BF and PP fibers increased the total water of requirement of the mix which had the same workability, and the incorporation of SF, however, have little effect on the total water requirement.The compressive strength of concrete incorporated with BF and PP fiber, respectively, is decreased by the increase of fiber content, because of the increase of the total water requirement. The compressive strength of concrete incorporated with SF is however increased with the increase of fiber content. The results of falling ball impact test show that the incorporation of fiber improves the bending load at the single impact of concrete slab, while the displacement of the slab during the impact process is reduced. The concrete with SF shows the highest repeated impact resistance. For concrete with PP fiber, the impact number is slightly higher than that of reference concrete. For concrete with BF, the number of repeated impacts is similar to that of reference concrete.