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首页> 外文期刊>Advances in materials science and engineering >Parameter Optimization of Graded Macadam Transitional Layer for Inverted Asphalt Pavement Based on the Mechanical Response and Strength Standard
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Parameter Optimization of Graded Macadam Transitional Layer for Inverted Asphalt Pavement Based on the Mechanical Response and Strength Standard

机译：基于机械响应和强度标准的倒沥青路面分级麦克风过渡层参数优化

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To improve the durability of asphalt pavement with heavy traffic conditions in cold regions, the parameter optimization of graded macadam transitional layer (GMTL) for the inverted asphalt pavement based on the mechanical response and the strength standard was studied. The stress distribution laws of GMTL were studied with different loads by means of BISAR3.0. The influences of the thickness and the modulus of GMTL on the pavement stress were analyzed. The optimal thickness and the modulus range of the GMTL were determined. Combined with a self-developing real-time data acquisition and a processing system for aggregate attitude (RDAPS), the strength control standard of the GMTL was established. Finally, the performance of the optimized inverted asphalt pavement structure was verified through the MEPDG design method. The results show that the tensile stress at the bottom of the surface layer reduced by about 58%, and the shear stress in GMTL increased by about 17% when the modulus of GMTL increases from 300?MPa to 800?MPa. However, the change in modulus has no significant influence on the maximum shear stress in the asphalt surface layer and the tensile stress in the base layer bottom. When the thickness of GMTL increases from 12?cm to 20?cm, the tensile stress in the bottom of the base layer reduced by about 31%. Based on the mechanical results from simulation calculation and the technical indicator required in the field, the recommended optimal parameters of GMTL are the modulus of 700?MPa and the thickness of 18?cm. In addition, the spatial attitude angle Φ N of wireless intelligent attitude aggregate (WIAA), the compressive strength R c standard, and the California Bearing Ratio (CBR) standard were analyzed, and the strength control standard of inverted asphalt pavement with GMTL was proposed, namely, CBR?≥?354%, R c ?≥?1.06?MPa, and Φ N ?≤?3°. A significant improvement in the resistance to crack can be seen in the inverted asphalt pavement when the optimized structure was applied. Taking the 20-year service life as an example, the top-down cracks reduced by 29.3% and the bottom-up cracks reduced by 32.6% in comparison to the original structure. The recommended structural parameters of GMTL could be used to guide the construction and design of inverted asphalt pavement in cold regions.
机译：为了提高寒冷地区的沥青路面耐久性，研究了基于机械响应和强度标准的倒沥青路面的分级麦克风过渡层（GMT1）的参数优化。通过BISAR3.0使用不同的负荷研究了GMTL的应力分布规律。分析了厚度和GMTL模量对路面应力的影响。确定了GMTL的最佳厚度和模量范围。结合自行的实时数据采集和用于聚集态度的处理系统（RDAPS），建立了GMTL的强度控制标准。最后，通过MEPDG设计方法验证了优化的倒数沥青路面结构的性能。结果表明，当表面层底部的拉伸应力降低约58％，当GMTL的模量从300μmO2增加时，GMT1中的剪切应力增加了约17％。然而，模量的变化对沥青表面层中的最大剪切应力和基层底部的拉伸应力没有显着影响。当GMT1的厚度从12℃增加到20℃时，基层底部的拉伸应力降低约31％。基于仿真计算的机械效果和现场所需的技术指标，GMTL的推荐最佳参数是700·MPa的模量，厚度为18Ω·厘米。此外，分析了无线智能姿态聚集（WIAA），压缩强度R C标准和加利福尼亚轴承比（CBR）标准的空间姿态角φn，提出了具有GMTL的倒沥青路面的强度控制标准，即CBR？≥？354％，R C？≥≤1.06？MPa，Φn≤≤≤≤x≤3°。当施加优化的结构时，可以在倒沥青路面中看到抗裂纹抗性的显着改善。以20年的使用寿命为例，自上而下的裂缝减少了29.3％，与原始结构相比，自下而上的裂缝减少了32.6％。 GMTL推荐的结构参数可用于指导寒冷地区倒沥青路面的构造和设计。

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