Details:

Creators:
Roque, Reynaldo ; Koh, Chulseung ; Chen, Yu ; Sun, Xingsong ; Lopp, George
Roque, Reynaldo ; Koh, Chulseung ; Chen, Yu ; Sun, Xingsong ; Lopp, George Less -
Corporate Creators:
University of Florida. Dept. of Civil and Coastal Engineering
Corporate Contributors:
Florida. Department of Transportation. Research Center
Subject/TRT Terms:
[+]
Asphalt--Testing Asphalt Concrete Open Graded Aggregates Pavements Superpave Tension Tests
Publication/ Report Number:
00054539
Resource Type:
Tech Report
Geographical Coverage:
Texas
Edition:
Final report; June 17, 2005-April 30, 2009
Corporate Publisher:
Florida Department of Transportation
Abstract:
A dog-bone direct tension test (DBDT) to accurately determine tensile properties of asphalt concrete,

including OGFC, was conceived, developed and validated. Resilient modulus, creep, and strength tests

were performed at multiple temperatures on dense-graded and OGFC mixtures produced two

aggregates with both the newly developed DBDT and existing Superpave IDT. Excellent

correspondence was observed between properties determined from each type of test, indicating that

fundamental properties can be accurately determined using either test. Differences in strain rate

between the two tests resulted in expected differences in strength and failure strain. Creep compliance

was highly correlated between the two tests but was lower for IDT than for DBDT, which can be

attributed to the higher confinement in IDT. It was concluded that DBDT compliance is more

appropriate for uniaxial stress states, while IDT compliance is more appropriate for biaxial stress states.

Continued use of Superpave IDT was recommended because it is much more practical. A composite

specimen (OGFC on HMA) direct tension fracture test was developed to evaluate the effects of OGFC

and interface conditions on top-down cracking performance. Results indicated that use of polymer

modified bonding agents can significantly improve cracking resistance of pavements with OGFC.

Continuum and micro-mechanics based FEM models developed to predict cracking performance of

composite mixtures indicated that traditional OGFC accelerates development of top-down cracking and

should not be assigned a structural benefit in pavement design. The modeling results also indicated the

benefit of polymer-modified bonding agents. The benefits of using micro-mechanics to optimize

OGFC design were illustrated. Recommendations were made for continued development and validation

of testing and modeling of composite systems to optimize OGFC design.


Format:
PDF
Funding:
BD545-53
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:4fa20495b282220c0fcbceb0b82cac7e3ec45151e27a4b0ae76f1c2f918cb4b6
Download URL:
https://rosap.ntl.bts.gov/view/dot/16911/dot_16911_DS1.pdf
File Type:

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