通过试验得出了C105混凝土100 mm×100 mm×100 mm立方体非标准试件抗压强度换算系数以及C105混凝土的标准方差和强度变异系数。采用理论计算，得到了棱柱体抗压强度与立方体抗压强度的比值αc1，并与试验实测平均值进行了比较，验证了理论计算方法的可行性。此外，通过对比分析，探讨了直接外延法和引用公式法两种C105混凝土设计参数计算方法的正确性，研究结果可为C105管桩混凝土的设计和应用提供参考。

Abstract: The conversion coefficient of C105 concrete compressive strength was obtained for the size of the 100 mm×100 mm×100 mm cubic specimen by testing. And the standard deviation and strength variable coefficient were obtained by statistical analysis. The ratio αc1 of prismatic compressive strength to cubic compressive strength was obtained by theoretical calculation, and compared with the measured average value, which verifies the feasibility of the theoretical calculation method. In addition, through the comparative analysis, the correctness of the direct epitaxy method and quoted formula method of C105 concrete design parameters was systematically discussed, and the research results can provide a reference for the design and application of C105 pile concrete.