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

Middendorf, Moritz ; Umbach, Cristin ; Böhm, Stefan ; Middendorf, Bernhard (2022):
Determination of Suitable Imaging Techniques for the Investigation of the Bonding Zones of Asphalt Layers. (Publisher's Version)
In: Materials, 14 (24), MDPI, e-ISSN 1996-1944,
DOI: 10.26083/tuprints-00020280,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Determination of Suitable Imaging Techniques for the Investigation of the Bonding Zones of Asphalt Layers
Language: English
Abstract:

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.

Journal or Publication Title: Materials
Journal volume: 14
Issue Number: 24
Publisher: MDPI
Collation: 16 Seiten
Uncontrolled Keywords: layers bond, asphalt, bitumen emulsion, X-ray computer tomography, asphalt petrology
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institutes of Transportation > Transportation Infrastructure Engineering
Date Deposited: 22 Apr 2022 12:11
Last Modified: 22 Apr 2022 12:11
DOI: 10.26083/tuprints-00020280
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-202804
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20280
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