BARMAN, MANIK
(2014)
Joint Performance Characterization of Bonded Whitetopping Overlays.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Poor joint performance in whitetopping overlays increases the magnitude of the interlayer debonding stress and load related stress, which can result in corner and longitudinal cracks. However, currently available whitetopping design procedures do not account for the joint performance. Fiber reinforced concrete (FRC) is commonly used in constructing these overlays but the contribution of the fiber to load transfer has never been quantified either.
Under the scope of this dissertation, a new, economical, small-scale joint performance characterization procedure (BALT) was developed. The results from the BALT procedure were validated by comparing them to the results from large scale joint performance tests (SALT). The joint performances of one plain concrete (PC) and two FRC mixtures were characterized with respect to mixture type, crack width and number of load cycles. Load transfer efficiency (LTE) and dissipated energy ratio (DER) prediction models were developed for all the mixtures. It was found that FRC provides a 15 to 25 percent higher joint performance as compared to PC. The fiber plays a larger role in load transfer when the joint is fatigued. Interestingly fibers do not fatigue even after 10 million load cycles. Using finite element analysis, a relationship was developed for determining the joint stiffness (AGG*) for whitetopping overlay. It was found that the load-related stress can be reduced by 6 percent with application of FRC while the interface debonding stress can be reduced by 50 to 72 percent.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
16 June 2014 |
| Date Type: |
Publication |
| Defense Date: |
8 November 2013 |
| Approval Date: |
16 June 2014 |
| Submission Date: |
28 January 2014 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
390 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Civil and Environmental Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Bonded concrete overlay, whitetopping, load transfer, LTE, Dissipated energy, Fatigue, Inter layer bonding, Joint performance, BALT, SALT |
| Additional Information: |
Please check this version.Thanks |
| Date Deposited: |
16 Jun 2014 19:06 |
| Last Modified: |
15 Nov 2016 14:17 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/20454 |
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