目的 研究废弃纤维再生混凝土梁正截面受弯性能和破坏形态与普通混凝土梁的差异,以期能早日应用于工程中.方法 在截面尺寸及配筋率相同的情况下,对1组普通混凝土梁以及再生骨料取代率为50％,废弃纤维体积掺量分别为0、0.08％、0.12％、0.16％的4组再生混凝土梁进行抗弯试验.结果 废弃纤维再生混凝土梁的抗弯破坏机理与普通混凝土梁基本一致.在废弃纤维再生混凝土梁的受弯过程中,梁的受拉钢筋屈服时间较晚,延性明显提升.开裂荷载以及极限荷载也均有一定提升,其中废弃纤维体积掺入量在0.12％时提升较多,开裂荷载提升约9％,极限荷载提升约9.7％.结论 将废弃纤维掺入再生混凝土中对于改善再生混凝土梁抗弯性能不足的缺陷切实有效,梁的延性及承载力均得到提升.%Studies the paper on the difference of concrete beam cross-section's flexural property and destruction characteristic between waste fiber recycled concrete beam and common concrete beam, with the aim to apply waste fiber recycled concrete beam into practice soon. Under the condition of same section size and same percentage of reinforcement, flexural properties test of 1 group of the common concrete beam and 4 groups of recycled concrete beams with 50% replacement ratio of recycled coarse aggregate and different waste fiber volume content at the ratios of 0,0. 08% ,0. 12% ,and 0. 16% respectively were conducted. The research has shown that,the characteristics of stress distortion and destruction of the waste fiber recycled concrete beam are basically the same as those of the common concrete beam. In the flexural process of the waste fiber recycled concrete beam,the waste fiber could significantly delay the tensile reinforcement yield, which resulted in the improvement of recycled concrete's ductility. The cracking load and the ultimate load of the beam were also increased. The result shows that when the waste fiber volume incorporation was at the ratio of 0. 12% ,the increase was at most,in which case the cracking load increased about 9% and the ultimate load increased 9. 7% approximately. The test has proved that waste fiber's incorporation into recycled concrete is a practical and effective method to improve the bending performance deficiency of recycled concrete beam,to increase concrete beam's ductility and bearing capacity.
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