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基体沥青混合料体积参数是半柔性路面材料设计的重要指标,它关系到半柔性路面的各项使用性能。通过体积法设计了不同空隙率以及相同空隙率、不同孔结构的基体沥青混合料,并且对不同龄期半柔性路面材料进行了力学性能和路用性能的试验,然后与普通沥青混合料的性能进行比较,分析研究基体沥青混合料的空隙率和孔结构对半柔性路面材料性能的影响规律。研究结果表明:随着基体沥青混合料空隙率的增加,半柔性路面材料的力学性能明显提高,路用性能有所改善;对相同空隙率、不同孔结构的基体沥青混合料,均匀级配设计的力学性能和路用性能优于连续级配设计。采用30%空隙率均匀孔结构基体沥青混合料制备的半柔性路面材料,7 d马歇尔稳定度高达17.69 kN,7 d劈裂强度达到6.32 kN,残留稳定度和冻融劈裂强度比均超过100%,动稳定度达到30000次/mm以上,低温抗弯拉劲度模量达到6486 MPa,抗压回弹模量模量达到2812 MPa。
The volume parameter of matrix asphalt mixture is an important index of semi-flexible pavement material design, which is related to the performance of semi-flexible pavement. The volumetric method was used to design the matrix asphalt mixture with different voidage, porosity and pore structure. The mechanical properties and road performance of semi-flexible pavement materials with different ages were tested. Then, the properties of common asphalt mixture The influence of porosity and pore structure of matrix asphalt mixture on the properties of semi-flexible pavement materials was analyzed and compared. The results show that with the increase of the porosity of the matrix asphalt mixture, the mechanical properties of the semi-flexible pavement material are obviously improved and the road performance is improved. For the uniform asphalt mixture with the same porosity and different pore structure, The mechanical properties and road performance is better than the continuous grading design. Semi-flexible pavement materials prepared by using 30% porous uniform matrix asphalt mixture have a 7-day Marshall stability of 17.69 kN, a 7-day splitting strength of 6.32 kN, and a residual stability of more than 100% of the freeze-thaw splitting strength %, The dynamic stability reaches more than 30,000 times / mm, the tensile modulus at low temperature reaches 6486 MPa and the compressive resilience modulus reaches 2812 MPa.