Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method

Saadeh, Shadi; El Asmar, Maria; San Jose State University. College of Business. Mineta Transportation Institute; California State University, Long Beach; California State University Transportation Consortium (CSUTC)

doi:10.31979/mti.2023.2243

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Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method

2023-09-01
By Saadeh, Shadi ; El Asmar, Maria

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English

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Details:

Creators:

Saadeh, Shadi ; El Asmar, Maria

Saadeh, Shadi ; El Asmar, Maria Less -
Corporate Creators:

San Jose State University. College of Business. Mineta Transportation Institute ; California State University, Long Beach ; California State University Transportation Consortium (CSUTC)

San Jose State University. College of Business. Mineta Transportation Institute ; California State University, Long Beach ; California State University Transportation Consortium (CSUTC) Less -
Corporate Contributors:

State of California SB1 2017/2018, Trustees of the California State University Sponsored Programs Administration
Subject/TRT Terms:

[+]

Aggregates By Shape And Surface Texture Air Voids Asphalt Binder Content Bonding Load Tests Tension Tests Test Procedures
Publication/ Report Number:

23-22
DOI:

https://doi.org/10.31979/mti.2023.2243
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report
Corporate Publisher:

San Jose State University. College of Business. Mineta Transportation Institute
Abstract:

Cracking is a primary mode of failure for asphalt concrete (AC), resulting in road damage and deterioration, and leading to an increase in road hazards and fatalities. Studying the fracture behavior of AC is an effective way to learn how to best enhance their cracking resistance. To do this, the indirect tensile cracking laboratory test (IDEAL-CT) was developed and used to assess the AC cracking behavior by defining a unique index that allows the ranking of different mixes’ cracking resistance. The sensitivity of the test results to the test parameters is needed to monitor the test’s performance. Several parameters impact the result of the IDEAL-CT. This study focuses on the variation of air voids, loading rate, aggregate shape, bonding type, and gradation mix. Performing more than 450 test scenarios—varying multiple factors and conducting enough tests for each variation—would require considerable resources and time. To solve the issue, the Particle Flow Code in two-dimension software (PFC2D) using the discrete element method (DEM) is adapted to mitigate the need for actual laboratory tests. Initial findings yielded a better understanding of the micromechanical behavior of each mix, showing that air void content has more impact than loading rate; a decrease of 2% in air voids resulted in an increase of more than 50% in cracking resistance. Additionally, different aggregate sources and bonding strengths affected the cracking resistance. These results can inform further studies on AC cracking in order to reduce road damage and deterioration to keep roads safe.
Format:

PDF
Funding:

ZSB12017-SJAUX
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:0d1e7bf37c7728af093f34a79fd9e984f5f2f831371194196856ad3c929a383a
Download URL:

https://rosap.ntl.bts.gov/view/dot/72358/dot_72358_DS1.pdf
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Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method

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