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Title:

Scanning Laser Detection of Crack Precursors in High RAP Content Asphalt Mixture with Improved Fatigue Performance

Accession Number:

01478736

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Formation of microcracks under fatigue conditions is a complex mechanism and difficult to detect. A microcrack is not apparent until late in fatigue life of the section. However, structural changes and microcracks can occur earlier and could be used as an originator for fatigue crack formations that lead to failure. Therefore, it is important to develop methods to promptly detect microcracks early in fatigue life well in advance of macrocrack growth. This paper presents the test procedure and analysis approach developed for a non-contact Scanning Laser Detection (SLD) for capturing and monitoring cracks in asphalt mixtures. The study focuses on utilizing SLD to investigate damage resistance of asphalt mixtures containing high Recycled Asphalt Pavement (RAP) content. Use of more RAP in asphalt materials is becoming increasingly popular due to the economic and environmental benefits of recycled materials. On the other hand, stiffer mixes resulting from RAP addition has raised concern about long term properties of pavement, therefore an accurate fatigue evaluation of these mixes are needed. The proposed scanning technique detects cracks in initiation and propagation phases and characterizes surface state with a parameter called Defect Frequency (DF). This parameter is used as direct indication of the light scattering signature of specimen and can be related to surface changes leading to crack initiation. For each mixture (50% RAP and a control), the fatigue lives determined from the SLD were compared and exhibited strong correlation with those obtained from the traditional mechanical and energy-based fatigue approaches.

Supplemental Notes:

This paper was sponsored by TRB committee AFK50 Characteristics of Asphalt Paving Mixtures to Meet Structural Requirements.

Monograph Accession #:

01470560

Report/Paper Numbers:

13-5136

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Ajideh, Hossein
Bahia, Hussain
Earthman, James

Pagination:

21p

Publication Date:

2013

Conference:

Transportation Research Board 92nd Annual Meeting

Location: Washington DC, United States
Date: 2013-1-13 to 2013-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Subject Areas:

Highways; Materials; Pavements; I30: Materials

Source Data:

Transportation Research Board Annual Meeting 2013 Paper #13-5136

Files:

TRIS, TRB, ATRI

Created Date:

Feb 5 2013 12:58PM