层布式混杂纤维混凝土弯曲韧性的试验研究

介绍了评价纤维混凝土弯曲韧性的不同方法,提出了修正的弯曲韧度方法来确定初裂挠度,克服其初裂挠度确定困难的缺点.通过试验研究了素混凝土、聚丙烯纤维混凝土和层布式混杂纤维混凝土的弯曲韧性.结果表明,聚丙烯纤维混凝土的弯曲韧度指数高于素混凝土,层布式混杂纤维混凝土的弯曲韧度指数也高于素混凝土,最后分析了纤维混凝土的增韧机理.

Experimental Study of Layered Hybrid Fiber Reinforced Concrete on Flexural Toughness

The different methods that evaluating flexural toughness of fiber reinforced concrete are introduced. Then the revised flexural toughness method is established, which overcomes the difficulty in obtaining the first cracking displacement by acoustic emission. The flexural toughness of plain concrete, polypropylene fiber reinforced concrete and layered hybrid fiber reinforced concrete are experimentally studied. The experimental results and analysis demonstrate that polypropylene fiber improves the flexural toughness of concrete while layered hybrid fiber improves that by more times. And the reinforcing mechanism is discussed.