纤维对掺膨胀剂超高性能混凝土性能的影响

Effect of Fiber on Properties of Super High Performance Concrete with Expansive Agent

研究了纤维种类、掺量和混杂纤维对掺膨胀剂超高性能混凝土UHPC性能的影响规律。结果表明:体积掺量相同时(3%),不同纤维对掺膨胀剂UHPC各项性能的影响不同,UHPC单掺镀铜钢纤维时工作性能较为优异,单掺多锚点钢纤维的时候力学性能与抗冲磨性能提升效果最好,样品单掺PVA纤维时工作性能、力学性能和抗冲磨性能都比单掺钢纤维低。随着镀铜钢纤维掺量的增加,掺膨胀剂UHPC的抗压、抗折和轴拉性能逐步提高,体积掺量为2.5%时混凝土抗冲磨能力最高,继续增加纤维掺量对混凝土抗冲磨性能的提升不明显。纤维混杂能够使UHPC兼具良好的工作性能、力学性能和抗冲磨性。体积掺量2.0%镀铜钢纤维、0.5%多锚点钢纤维和0.1%PVA纤维混掺时,UHPC各项性能达到最佳。

This paper studies the influence of fiber types,fiber content and hybrid fiber on the performance of UHPC with expansive agent.The results show that when the content is the same(3%),different fibers have different effects on the properties of UHPC with expansive agent.The working performance of UHPC is better when the copper-plated steel fiber is added alone.The mechanical properties and abrasion resistance of UHPC are improved best when the multi-anchorage steel fiber is added alone.The working performance,mechanical properties and abrasion resistance of the sample with PVA fiber are lower than those with steel fiber.With the increase of the content of copper-plated steel fiber,the compressive,flexural and axial tensile properties of UHPC doped with expansive agent are gradually improved.When the content is 2.5%,the abrasion resistance of concrete is the highest,and the improvement of abrasion resistance of concrete is not obvious with the continuous increase of fiber content.Fiber hybrid can make UHPC have good working performance,mechanical properties and abrasion resistance.When 2.0% copper-coated steel fiber,0.5% multi-anchorage steel fiber and 0.1%PVA fiber are mixed,UHPC has the best performance.