Pérez-Jiménez Félix E, Miró Rodrigo, Botella Ramón, López-Montero Teresa, Martínez Adriana H
Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain.
Materials (Basel). 2022 Jan 21;15(3):790. doi: 10.3390/ma15030790.
One of the basic assumptions of analytical dimensioning models of asphalt pavements is failure due to fatigue cracking of the bituminous layers. Furthermore, it is considered that the damaging effects of different traffic loads are linear and cumulative, per Miner's law. However, the analysis carried out on the effect of temperature, rest periods, and ageing of the bituminous materials questions considering fatigue failure as the only and main assumption for the calculation of the pavement life. Ageing of the pavement asphalt layers results in stiffening and transverse cracking. Consequently, these asphalt layers are no longer of infinite extent in the horizontal direction and their response resembles that of a slab. The application of this last calculation assumption provides pavement sections more in line with those used in Spain in the Catalogue of Structural Sections, which is based on experience gained from the real behavior of those sections. The calculation based on the fatigue laws results in undersized structures. This paper shows the results of a strain sweep test implemented at the UPC Roads Laboratory, which was used to analyse all the aforementioned effects and to propose a calculation procedure for heavy traffic pavements considering transverse cracking of the asphalt layers.
沥青路面分析尺寸模型的基本假设之一是沥青层因疲劳开裂而失效。此外，根据Miner定律，不同交通荷载的破坏作用被认为是线性且累积的。然而，对温度、休息期和沥青材料老化影响的分析对将疲劳失效作为计算路面寿命的唯一主要假设提出了质疑。路面沥青层的老化会导致变硬和横向开裂。因此，这些沥青层在水平方向上不再是无限延伸的，其响应类似于平板。应用这一最后的计算假设可使路面截面更符合西班牙《结构截面目录》中使用的截面，该目录基于从这些截面的实际性能中获得的经验。基于疲劳定律的计算会导致结构尺寸过小。本文展示了在加泰罗尼亚理工大学道路实验室进行的应变扫描试验结果，该试验用于分析上述所有影响，并提出一种考虑沥青层横向开裂的重载路面计算方法。
