The importance of wetting in healing of bitumen

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Abstract

Asphalt concrete has the advantageous ability to heal autonomously, however the mechanisms behind this are not fully understood. To increase insight in the healing mechanism, the healing model used in polymer science is adopted. It interprets healing as the sum of wetting and intrinsic healing. The presented work introduces a new test set-up, which is designed to investigate the relative contribution of wetting and intrinsic healing by measuring the strength gain when two pieces of binder are brought into contact. Results obtained show that for a soft, pure binder, wetting is the dominant process. This can be concluded from the fact that at least 50% of the observed healing can be attributed to wetting. Wetting is highly dependent on both the load level and the duration of load application. Consequently, it is shown that the level of healing observed in asphalt concrete is very dependent on the boundary conditions.

Original languageEnglish
Title of host publicationFunctional Pavement Design - Proceedings of the 4th Chinese-European Workshop on Functional Pavement Design, CEW 2016
EditorsS. Erkens, X. Liu, K. Anupam, T Yiqiu
PublisherCRC Press / Balkema - Taylor & Francis Group
Pages489-498
Number of pages10
ISBN (Electronic)9781315643274
ISBN (Print)9781138029248
Publication statusPublished - 2016
Event4th International Chinese European Workshop (CEW) on Functional Pavement Design - Delft, Netherlands
Duration: 29 Jun 20161 Jul 2016
Conference number: 4

Conference

Conference4th International Chinese European Workshop (CEW) on Functional Pavement Design
Abbreviated titleCEW 2016
CountryNetherlands
CityDelft
Period29/06/161/07/16

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