Influence of soiling phenomena on air-void microstructure and acoustic performance of porous asphalt pavement

Alber, Stefan; Ressel, Wolfram; Liu, Pengfei; Wang, Dawei; Oeser, Markus

doi:10.1016/j.conbuildmat.2017.10.069

Cited by 37 publications

(10 citation statements)

References 17 publications

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“…In particular, the 3D structure of porous asphalt has been investigated in numerous research works [ 1 , 12 , 13 , 14 ]. For porous asphalts, the void structure is fundamental, as this is the most common solution for noise reduction and roads with a minimized risk of aquaplaning after heavy rainfall [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…The problem with porous asphalts is, on the one hand, the abrasion of the binder due to drainage and, on the other hand, the sealing with dirt. In their research work in 2018, Alber et al [ 12 , 13 ] examined dirty and clean specimens of porous asphalt with CT and showed correlations with sound absorption. In addition to analyzing void structures, Chen et al [ 17 ] used X-ray computed tomography to characterize fatigue damage in asphalt mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of 2D Petrographic and 3D X-ray Tomography Investigations of Air Voids in Asphalt

et al. 2023

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Knowledge of the exact composition of building materials (aggregate, binder, air voids, etc.) is essential for the further development of more resistant and sustainable building materials. In numerous scientific studies, the material behavior of asphalt is tested using mechanical methods. Here, the overall material behavior is determined (bitumen, air voids, aggregate). With the advent of imaging techniques, it is becoming possible to determine the individual constituents separately and perform a more detailed analysis of their location, shape and composition. Three-dimensional and two-dimensional methods are available for this purpose. For this study, two different types of asphalt (porous asphalt and asphalt concrete) were analyzed using 3D X-ray computed tomography and asphalt petrology as 2D methods; the results of both investigations are compared. The objective of this study is to determine whether the 2D method provides suitable results for the microstructural analysis of asphalt samples and how the results differ from those studied by the 3D method. The comparison shows that both methods can be used to analyze voids in asphalt samples. The 2D method provides valuable insight into the distribution of voids in a sample. In addition to the distribution of voids within a 2D section, the 2D method can also be used to make some structural statements about the location and structure of the voids in the 2D plane. The X-ray computed tomography method allows more complex analyses of the pore structure because of the third direction (3D). In addition, the 3D method provides more data, so that the pore structure can be described even more precisely, and the pore size (length, width, height) can be mapped and analyzed with a high degree of accuracy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Study of 2D Petrographic and 3D X-ray Tomography Investigations of Air Voids in Asphalt

et al. 2023

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“…In other publications, different aspects regarding the types and distributions of air voids are considered [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Air vo with a diameter of up to approx. 2.0 mm were detected in mastic asphalt specimens [1 In other publications, different aspects regarding the types and distributions of air vo are considered [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Determination of Suitable Imaging Techniques for the Investigation of the Bonding Zones of Asphalt Layers

et al. 2021

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The material behavior of asphalt depends on its composition of aggregate, bitumen, and air voids. Asphalt pavements consist of multiple layers, making the interaction of the materials at the layer boundary important so that any stresses that occur can be relieved. The material behavior at the layer boundary is not yet understood in detail, as further methods of analysis are lacking in addition to mechanical methods. For this reason, the layer boundary of asphalt structures was analyzed using imaging methods. The aim of this research was to find an imaging method that allows a detailed analysis of the bonding zone of asphalt layers. Two different imaging techniques were used for this purpose. One is a 2-D imaging technique (asphalt petrology) and the other is a 3-D imaging technique (high-resolution computed tomography). Image analysis is a widely used technique in materials science that allows to analyze the material behavior and their composition. In this research, attention was paid to the analysis of the position of the bitumen emulsion, because the contained bitumen is supposed to bond the layers together. It was found that the application of 2-D imaging (asphalt petrology) lacked the precision for a detailed analysis of the individual materials at the layer boundary. With high-resolution computed tomography, a detailed view is possible to visualize the individual materials at the layer boundary in 3D. However, it is difficult to differentiate the materials because there are no gradations in the gray values due to the identical densities. However, it is possible to differentiate between the bitumen from the asphalt and from the emulsion if a high-density tracer is added to the bitumen emulsion for the CT studies. The results of the investigations are presented in this article.

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“…Many researchers have paid attention to the pore structure parameters such as porosity, tortuosity, and pore sizes by applying the x-ray computed tomography scans. Alber [14,15] analyzed the characteristic parameters of the air void and skeleton structures and influence of soiling phenomena on air-void microstructures of the porous asphalt through the CT scanning technique. Mahmud [16] used a non-destructive method (CT method) employing virtual cut section to analyze the content, number, shape, and size of voids of laboratory-fabricated porous asphalt.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nominal Maximum Aggregate Size and Aggregate Gradation on Pore Characteristics of Porous Asphalt Concrete

Huang

Cai

et al. 2020

Materials

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Porous asphalt concrete (PAC) has been used to improve the traffic conditions in rainy weather due to its high porosity. Aggregate size and gradation have great impact on the connected pore structure, which ultimately affects the permeability of porous asphalt concrete. In this paper, the topological properties of connective pores including pore area, pore circularity, equivalent pore diameter, and void network of porous asphalt concrete with different nominal maximum aggregate sizes and gradations were analyzed using x-ray computer tomography scans and the image processing technique. It was observed that the maximum aggregate sizes will not have significant effect on the percentage of connected pores to total pores for porous asphalt concrete. Furthermore, the percentage of connected pores to total pores is related to the air void content, but for PAC-13 with 20% target air void content or above, the connectivity does not seem to have a sharp increase. Additionally, porous asphalt concrete with a smaller nominal particle size or lower target air void content seems to generate a more concentrated distribution of Eqdiameter. Moreover, pore circularities for porous asphalt concrete with a maximum aggregate size of 10 mm or above are independent of maximum aggregate sizes. Air void contents ranging from 16% to 21% do not have a significant effect on the voids’ circularity. Furthermore, the branching nodes in porous asphalt concrete with a smaller nominal maximum aggregate size or lower target air void content have a more uniform spatial distribution. However, the percentage of cross-linked number to total node raises as the nominal maximum aggregate size or target air void content increases.

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Influence of soiling phenomena on air-void microstructure and acoustic performance of porous asphalt pavement

Cited by 37 publications

References 17 publications

Comparative Study of 2D Petrographic and 3D X-ray Tomography Investigations of Air Voids in Asphalt

Comparative Study of 2D Petrographic and 3D X-ray Tomography Investigations of Air Voids in Asphalt

Determination of Suitable Imaging Techniques for the Investigation of the Bonding Zones of Asphalt Layers

Influence of Nominal Maximum Aggregate Size and Aggregate Gradation on Pore Characteristics of Porous Asphalt Concrete

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