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在珊瑚砂中掺加纤维可改善珊瑚砂微生物固化体强度等力学性能,对固化体进行了无侧限抗压强度试验和抗拉强度试验,分析了纤维掺量对固化体力学性能的影响。结果表明,不同纤维掺量的试样均可以通过微生物固化反应形成整体;掺加纤维可以有效防止固化体发生脆性破坏,明显提高固化体延性。与不掺加纤维的固化体相比,纤维掺量为0.2%的固化体抗拉强度最高,无侧限抗压强度也明显提高;掺量为0.3%的固化体抗拉强度降低,抗压强度大幅提高;掺量为0.1%和0.4%的固化体力学性能大幅度降低。得出了最佳纤维掺量,为微生物固化技术在岛礁工程中的应用奠定基础。
The incorporation of fiber in the coral sand can improve the mechanical properties of the coral sand microbial solidified body. The unconfined compressive strength and tensile strength of the solidified body were tested, and the influence of the fiber content on the mechanical properties of the solidified body was analyzed. The results showed that all the samples with different fiber contents could be formed through the solidification reaction of microorganisms. The addition of fiber could effectively prevent the brittle failure of the solidified body and obviously improve the ductility of the solidified body. Compared with the non-doped fiber, the cured product with the fiber content of 0.2% had the highest tensile strength and unconfined compressive strength. The tensile strength of the cured product with the content of 0.3% The strength is greatly improved; the mechanical properties of solidified body with dosage of 0.1% and 0.4% are greatly reduced. The optimal fiber content was obtained, which laid the foundation for the application of microbial solidification technology in the reef project.