Details:

Creators:
Kim, Sung-Hee ; Yang, Jidong
Kim, Sung-Hee ; Yang, Jidong Less -
Corporate Creators:
Southern Polytechnic State University. Georgia Pavement and Traffic Research Center
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Alligator Cracking Base Course (Pavements) California Bearing Ratio Deformation Fine Aggregates Modulus Of Resilience Pavement Design Pavement Performance Screenings
Publication/ Report Number:
FHWA-GA-10-1328
Resource Type:
Tech Report
Geographical Coverage:
Georgia
Corporate Publisher:
Georgia. Department of Transportation. Office of Research
Abstract:
In this study, the effects of No. 810 screening contents in GAB on pavement performance and GAB strength were investigated. One

Group I (013C) source and three Group II sources (028C, 048C, and 158C) were selected and specimens were prepared for Proctor Test,

CBR measurement, and morphological analysis. It showed that Proctor and CBR test results were influenced by morphological data and

particle size distribution. It was found that replacing 25% of GAB with No. 810 screening materials decreased the density and strength of

Group II assemblies while the opposite was true for Group I assemblies. Pavement performance with/without screening materials in GAB

was simulated using the MEPDG software based on the measured CBR. As a result, replacing GAB with 25% of screening materials

increased alligator cracking when Group II sources were used and decreased alligator cracking when Group I sources were used.

Nevertheless, most of the aggregate assemblies with 25% of screening materials didn’t meet the GDOT’s GAB gradation requirements.

Thus, further investigations including the permeability, plasticity index, resilient modulus, and life cycle cost analysis, may be needed

prior to the adoption of screening materials in GAB.

Additionally, a new methodology was developed to estimate the stress-strain relationship of unbound aggregate base using linear

viscoelastic theory. Aggregate specimens prepared from two different sources were subjected to CBR test and relaxation modulus test

thereafter. From the test data, the time-dependent stress due to a known strain rate was computed as a convolution integral of the strain.

The computed stress-strain relationship was compared with ones from the resilient modulus test. The results indicate that the stress-strain

relationships from the resilient modulus test and the convolution integral are quite comparable with nearly same slopes when horizontal

stress is assumed as approximately 45% of vertical stress. Given this agreement, the proposed methodology could be used to assist state

highway agencies to validate the resilient modulus test results for quality control and quality assurance of aggregate base materials for

pavement design and construction.


Format:
PDF
Funding:
(RP 13-28)
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:84196577a44e95106e077429b6ac64c274c452fddc8961fa1cf12569f601e15d
Download URL:
https://rosap.ntl.bts.gov/view/dot/28654/dot_28654_DS1.pdf
File Type:

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