Thesis
Dynamic modulus test: laboratory investigation and future implementation in the State of Washington
Washington State University
Master of Science (MS), Washington State University
2008
Handle:
https://hdl.handle.net/2376/102922
Abstract
The objectives of this study were to investigate and develop a database of dynamic modulus of the mixes widely used in the State of Washington, to investigate the sensitivity of dynamic modulus to aggregate gradation, and to evaluate the distress prediction accuracy of the 2002 Guide for the Design of New and Rehabilitated Pavement Structures (MEPDG). Seven Hot Mix Asphalt (HMA) mixes, designated as Job Mix Formula (JMF) mixes, widely used in the State of Washington were first selected; a lower modified mix (LM) and an upper modified mix (UM), were derived from each JMF mix by decreasing percent-passing sieve #200 by 2% in the LM mix and increasing by 2% in the UM mix. Twenty-one mixes--two replicates in each mix--altogether forty-two specimens were prepared for the dynamic modulus tests; the mixes include seven JMF mixes, seven LM mixes and seven UM mixes. Target air voids in the test specimens were 7±1%. Dynamic Shear Rheometer (DSR) tests were conducted to measure the complex shear modulus (G*) of the asphalt binders. Sigmoidal master curves were constructed for all the mixes. The dynamic modulus data were analyzed statistically. Dynamic modulus of the JMF mixes showed significant variation at high temperatures. It was not sensitive to the ±2% variation in percent-passing sieve #200. Aggregate gradation influenced variation in dynamic modulus at high temperatures. A database of dynamic modulus values of the mixes investigated and a database of sigmoidal fitting parameters for determining dynamic modulus of the mixes at any temperature and frequency were developed. The performance of the mixes i.e. distresses were predicted using MEPDG. The predicted performance data were analyzed statistically. The MEPDG predicted rutting and alligator cracking reasonably well. Predicted IRI and measured IRI varied significantly; longitudinal cracking were inconsistent.
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Details
- Title
- Dynamic modulus test
- Creators
- Muthukumaran Anbilpadugai Elangovan
- Contributors
- Laith Tashman (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525383001842
- Language
- English
- Resource Type
- Thesis