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到目前为止,我国对于纤维混凝土桥面铺装路用性能的研究尚不充分。本文选择聚丙烯粗纤维和玄武岩纤维两种常用纤维,研究了纤维掺量对混凝土路用性能的影响规律,进一步探讨纤维掺量对混凝土早期开裂的影响规律。试验结果表明:聚丙烯纤维混凝土的抗折和抗压强度均呈现随着纤维掺量的增加而先增加后减少的发展趋势;掺入纤维后混凝土从7d开始干缩率得到抑制降低,并且随着纤维掺量的增加,干缩率降低的幅度也在逐步增大;纤维的加入能够明显提高混凝土韧性和早期抗裂性。
So far, the research on the road performance of fiber-reinforced concrete bridge deck surfacing is not yet sufficient. In this paper, two kinds of commonly used fibers, polypropylene crude fiber and basalt fiber, were selected to study the effect of fiber content on concrete road performance. The influence of fiber content on early cracking of concrete was also discussed. The experimental results show that the flexural and compressive strengths of polypropylene fiber reinforced concrete (CFRP) increase first and then decrease with the increase of fiber content. The shrinkage of concrete decreases from 7 days after fiber incorporation, With the increase of fiber content, the shrinkage reduction rate is also gradually increased; the addition of fibers can significantly improve the toughness of concrete and early crack resistance.