玄武岩纤维对CFSGB混合料力学性能影响

Effect of basalt fiber on mechanical properties of CFSGB mixtures

为研究玄武岩纤维对水泥粉煤灰稳定风积沙砾石基层(Cement fly ash stabilized aeolian sand gravel base,简称CFSGB)混合料力学性能影响,以CFSGB混合料为研究对象,采用正交试验设计了9种玄武岩纤维增强CFSGB混合料配合比,研究玄武岩纤维掺量为0.5‰、1.0‰、1.5‰及长度为6 mm、12 mm、18 mm对CFSGB混合料力学性能影响,通过显著性分析明确纤维掺量及长度对CFSGB混合料强度影响关系。结果表明:玄武岩纤维的掺入能够明显提高CFSGB混合料的抗压强度和劈裂强度,混合料的抗压强度、劈裂强度均随着纤维掺量及长度的增加呈先增大后减小趋势,当纤维长度为12 mm、掺量为0.5‰~1.5‰时,混合料的抗压强度和劈裂强度最大提高范围为9.65%、13.65%;通过显著性分析发现,纤维长度对CFSGB混合料强度影响高度显著,得出纤维最佳掺量为1‰,最佳长度为12 mm。研究对玄武岩纤维改良CFSGB混合料用于沙漠地区公路基层填料的适用性具有一定的参考价值。

In order to study the effect of basalt fibers on the mechanical properties of cement fly ash stabilized aeolian sand gravel base(abbreviated as CFSGB)mixtures,with CFSGB mixtures as the object of study,nine kinds of basalt fiber reinforced CFSGB mixture ratios were designed using orthogonal design to study the effect of basalt fiber dosage 0.5‰,1.0‰,1.5‰,and the lengths of 6 mm,12 mm,and 18 mm on the mechanical properties of CFSGB mixtures.Through the significance analysis,the relationship between the fiber dosage and length on the strength of the CFSGB mixtures was clarified.The results show that basalt fiber blending can significantly improve the compressive strength and splitting strength of CFSGB mixtures,the compressive strength and splitting strength of mixtures show a trend of increasing and then decreasing with the increase of fiber dosage and length,and when the fiber length is 12 mm and the dosage is 0.5‰~1.5‰,the maximum range of increase in compressive strength and splitting strength of the mix is 9.65%and 13.65%.Through the significance analysis,it is found that the fiber length has a highly significant effect on the strength of CFSGB mixtures,and the optimum fiber dosage of 1‰and the optimum length of 12 mm are derived.The applicability of basalt fiber-modified CFSGB mixtures for use as filler in the base layer of highways in desert areas is investigated.