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Title:

Finite Element Modeling and Laboratory Validation of Evaporation-Induced Moisture Damage to Asphalt Mixture

Accession Number:

01662776

Record Type:

Component

Abstract:

Moisture damage is a major pavement distress which may cause premature failure. In this study, moisture damage directly due to evaporation was investigated. A finite-element model coupled with a comprehensive laboratory testing was developed to simulate and validate the effect of evaporation-induced moisture damage on asphalt mixture load bearing in indirect tensile strength test. In the model, cohesive zone method (CZM) was used to address crack initiation and development at aggregate-mastic interface. Quadratic nominal strain and BK exponential damage progress curve were considered for failure due to interaction of shear and normal forces. Fick’s first law was incorporated into the model to simulate moisture diffusion in asphalt mixtures after hours of curing with saturated cold evaporation. Several tests were carried out to derive input mechanical and moisture related parameters for the model. These tests include static creep test on mastic, single-edge notch beam (SENB) on asphalt mixtures, and evaporation diffusion coefficient test on aggregates and mastic. Appropriate moisture-dependent properties according to previous studies was assigned to mastic and aggregate-mastic interface. For laboratory validation, nine samples were fabricated and IDT strength test was performed on them. Samples were cured for 192, 456, and 672 hours and tested at loading rates of 0.1, 0.05, and 0.075 mm/s. Comparison of load-time plots obtained from laboratory tests and model results showed a descent match in terms of peak load and plot shape. Analysis of factors influencing IDT strength revealed that aggregate-mastic adhesion had a higher contribution to strength of samples compared to mastic cohesion.

Supplemental Notes:

This paper was sponsored by TRB committee AFK40 Standing Committee on Surface Requirements of Asphalt Mixtures.

Report/Paper Numbers:

18-05818

Language:

English

Authors:

Bozorgzad, Ashkan
Kazemi, Seyed-Farzan
Nejad, Fereidoon Moghadas

Pagination:

19p

Publication Date:

2018

Conference:

Transportation Research Board 97th Annual Meeting

Location: Washington DC, United States
Date: 2018-1-7 to 2018-1-11
Sponsors: Transportation Research Board

Media Type:

Web

Features:

Figures; References; Tables

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2018 Paper #18-05818

Files:

TRIS, TRB, ATRI

Created Date:

Jan 8 2018 11:30AM