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通过对散体力学剪切模量公式的分析,提出以剪切模量为控制指标的沥青混合料级配设计方法,在设计步骤中充分考虑粗集料的剪切模量而不是以最小间隙率为控制指标,提高了沥青混合料的抗剪切性能,解决了沥青混合料出现高温稳定性不足易发生车辙病害的问题。新方法设计出的级配以粗集料形成抗剪骨架,细集料充分填充,最终形成骨架抗剪密实结构。通过室内试验比较分析,其高温稳定性和水稳定性优于比较级配,低温抗裂性满足规范要求,证明了以剪切模量为控制指标的级配设计方法,可以提高沥青混合料料的高温稳定性,减少高速公路车辙病害的发生。
Based on the analysis of the shear modulus formula of the bulk mechanics, the grading design method of asphalt mixture with the shear modulus as the control index is proposed. In the designing step, the shear modulus of the coarse aggregate is fully considered instead of the minimum gap Rate as a control index to improve the shear resistance of asphalt mixture to solve the asphalt mixture is prone to rutting problems due to high temperature stability problems. The new method designed gradation with coarse aggregates to form shear scaffold, fine aggregate fully filled, and finally form a skeleton shearing solid structure. Through the comparative analysis of indoor tests, the high temperature stability and water stability are better than the comparative grade, and the low temperature crack resistance meets the specification requirements. It proves that the grading design method with the shear modulus as the control index can improve the asphalt mixture Of the high temperature stability, reduce the occurrence of highway rutting diseases.