玄武岩纤维对混凝土力学性能影响试验研究

Experimental Study on the Influence of Basalt Fiber on the Mechanical Properties of Concrete

为解决普通水工混凝土力学性能不足的问题,采用单丝长度12 mm的玄武岩纤维为原料,研究了玄武岩纤维掺量对混凝土抗压、抗拉、抗渗及抗冲磨4个性能的影响,并分析其影响机理。结果表明,随着玄武岩纤维掺量的增加,混凝土抗压强度一定程度降低,劈裂抗拉强度先减小后增加,体积掺量为0.3%时劈裂抗拉强度可提高3%。混凝土中掺入0.1%、0.2%的玄武岩纤维,抗渗性能分别提高14%、29%。在常规混凝土中掺入玄武岩纤维后会显著降低抗冲磨强度。研究成果可为不同应用场景下水工混凝土的配合比优化设计提供参考和借鉴。

To solve the problem of insufficient mechanical properties of ordinary hydraulic concrete,basalt fibers with a single fiber length of 12 mm were used as raw materials to investigate the influence of basalt fiber content on four performance indicators of concrete,namely compression resistance,tensile strength,impermeability,and abrasion resistance,and their influencing mechanisms were analyzed.The results show that with the increase of basalt fiber content,the compressive strength of concrete reduces to a certain extent,and the splitting tensile strength first decreases and then increases.When the volume content is 0.3%,the splitting tensile strength increases by 3%.Adding 0.1%and 0.2%basalt fibers to concrete can improve the impermeability to 14%and 29%,respectively.Adding basalt fibers to conventional concrete can significantly reduce its impact and wear resistance.The research results can provide reference and inspiration for optimizing the mix proportion design of hydraulic concrete in different application scenarios.