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Investigation of Voids Characteristics in an Asphalt Mixture Exposed to Salt Erosion Based on CT Images

The performance of an asphalt mixture will deteriorate under the condition of salt erosion, but there are different opinions on the mechanism of deterioration. Few studies have focused on the relation between the change of void characteristics and performance deterioration of an asphalt mixture expo...

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Autores principales: Xiong, Rui, Jiang, Wenyu, Yang, Fa, Li, Kehong, Guan, Bowen, Zhao, Hua
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6888340/
https://www.ncbi.nlm.nih.gov/pubmed/31744220
http://dx.doi.org/10.3390/ma12223774
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author Xiong, Rui
Jiang, Wenyu
Yang, Fa
Li, Kehong
Guan, Bowen
Zhao, Hua
author_facet Xiong, Rui
Jiang, Wenyu
Yang, Fa
Li, Kehong
Guan, Bowen
Zhao, Hua
author_sort Xiong, Rui
collection PubMed
description The performance of an asphalt mixture will deteriorate under the condition of salt erosion, but there are different opinions on the mechanism of deterioration. Few studies have focused on the relation between the change of void characteristics and performance deterioration of an asphalt mixture exposed to salt erosion. To explore the relation between the air voids characteristics of an asphalt mixture and mechanical damage under salt erosion, the mechanical damage in an asphalt mixture was measured by splitting strength. The asphalt mixture specimens, immersion solutions, asphalt mortar, and aggregate were scanned with CT technology. To segment the voids, the Otsu method was used over asphalt mortar and solution range of CT values. A three-dimensional reconstruction of the CT image was performed with Mimics 20 software to calculate the asphalt mixture’s void characteristics. On this basis, the relationships between the change in void characteristics and splitting strength were analyzed. The results showed that the ideal calculated void fraction can be obtained by threshold segmentation of the image void/asphalt mortar interface with the local CT value Otsu method. Under the salt corrosion environment, the increase of open voids of an asphalt mixture is linearly correlated with the decrease of splitting strength, while salts’ crystallization in the open voids produces crystallization pressure, accelerating the volume growth of open voids. The early damage of an asphalt mixture suffered from the salt may be mainly physical damage. These results can provide a useful reference for the performance of damage research on asphalt mixtures in salt enrichment areas.
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spelling pubmed-68883402019-12-09 Investigation of Voids Characteristics in an Asphalt Mixture Exposed to Salt Erosion Based on CT Images Xiong, Rui Jiang, Wenyu Yang, Fa Li, Kehong Guan, Bowen Zhao, Hua Materials (Basel) Article The performance of an asphalt mixture will deteriorate under the condition of salt erosion, but there are different opinions on the mechanism of deterioration. Few studies have focused on the relation between the change of void characteristics and performance deterioration of an asphalt mixture exposed to salt erosion. To explore the relation between the air voids characteristics of an asphalt mixture and mechanical damage under salt erosion, the mechanical damage in an asphalt mixture was measured by splitting strength. The asphalt mixture specimens, immersion solutions, asphalt mortar, and aggregate were scanned with CT technology. To segment the voids, the Otsu method was used over asphalt mortar and solution range of CT values. A three-dimensional reconstruction of the CT image was performed with Mimics 20 software to calculate the asphalt mixture’s void characteristics. On this basis, the relationships between the change in void characteristics and splitting strength were analyzed. The results showed that the ideal calculated void fraction can be obtained by threshold segmentation of the image void/asphalt mortar interface with the local CT value Otsu method. Under the salt corrosion environment, the increase of open voids of an asphalt mixture is linearly correlated with the decrease of splitting strength, while salts’ crystallization in the open voids produces crystallization pressure, accelerating the volume growth of open voids. The early damage of an asphalt mixture suffered from the salt may be mainly physical damage. These results can provide a useful reference for the performance of damage research on asphalt mixtures in salt enrichment areas. MDPI 2019-11-17 /pmc/articles/PMC6888340/ /pubmed/31744220 http://dx.doi.org/10.3390/ma12223774 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xiong, Rui
Jiang, Wenyu
Yang, Fa
Li, Kehong
Guan, Bowen
Zhao, Hua
Investigation of Voids Characteristics in an Asphalt Mixture Exposed to Salt Erosion Based on CT Images
title Investigation of Voids Characteristics in an Asphalt Mixture Exposed to Salt Erosion Based on CT Images
title_full Investigation of Voids Characteristics in an Asphalt Mixture Exposed to Salt Erosion Based on CT Images
title_fullStr Investigation of Voids Characteristics in an Asphalt Mixture Exposed to Salt Erosion Based on CT Images
title_full_unstemmed Investigation of Voids Characteristics in an Asphalt Mixture Exposed to Salt Erosion Based on CT Images
title_short Investigation of Voids Characteristics in an Asphalt Mixture Exposed to Salt Erosion Based on CT Images
title_sort investigation of voids characteristics in an asphalt mixture exposed to salt erosion based on ct images
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6888340/
https://www.ncbi.nlm.nih.gov/pubmed/31744220
http://dx.doi.org/10.3390/ma12223774
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