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Title: Mechanistic–Empirical Model for Top-Down Cracking Initiation of Asphalt Pavements
Accession Number: 01661491
Record Type: Component
Abstract: Top-down cracking (TDC) has become a major concern in pavement design and maintenance. In this study, a new mechanistic-empirical model is developed to predict TDC initiation of asphalt pavements. TDC initiation phase herein is defined as the stage for micro-cracks to coalesce into a visible macro-crack at pavement surface. With the aid of J-integral, micro-fracture mechanics and Miner’s hypothesis are first used as the fundamental mechanistic approaches to calculate the numbers of loading cycles at different load spectrum levels and the corresponding cumulative damage in the TDC initiation phase. A prediction model for air void distribution within asphalt layer is developed based on the X-ray Computed Tomography measurement since the air voids are initial flaws in asphalt mixtures especially for the pavement surface. The Long-Term Pavement Performance (LTPP) data including traffic loads, pavement distresses, material properties, pavement structures and environmental effects are collected and analyzed for 60 pavement sections distributed in different climatic zones. Traffic load is characterized using the load spectra model and the TDC initiation time is predicted from historical distress observations. The collected LTPP data are utilized to develop the prediction models for the energy parameter and TDC initiation time. Annual average daily truck traffic (AADTT), unaged modulus, environmental effects and pavement structure are the key factors for the energy parameter. Unaged modulus, AADTT, energy parameter and air void content are critical to the TDC initiation time. As illustrated in the development and validation process, the prediction model shows good agreement with the field performance.
Supplemental Notes: This paper was sponsored by TRB committee AFD80 Standing Committee on Pavement Structural Modeling and Evaluation.
Report/Paper Numbers: 18-03266
Language: English
Authors: Pagination: 8p
Publication Date: 2018
Conference:
Transportation Research Board 97th Annual Meeting
Location:
Washington DC, United States Media Type: Digital/other
Features: Figures; References
TRT Terms: Identifier Terms: Uncontrolled Terms: Subject Areas: Highways; Maintenance and Preservation; Materials; Pavements
Source Data: Transportation Research Board Annual Meeting 2018 Paper #18-03266
Files: TRIS, TRB, ATRI
Created Date: Jan 8 2018 10:47AM
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0000-0001-9459-9349