Effect of tie bars on the field performance of full-depth repair on concrete pavement
| Autor: | Dar-Hao Chen, Jianbo Yuan, Feng Hong |
|---|---|
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Road Materials and Pavement Design. 13:12-25 |
| ISSN: | 2164-7402 1468-0629 |
| DOI: | 10.1080/14680629.2011.644076 |
| Popis: | Many Full-Depth Repairs (FDRs) have suffered recurring failures and thus there is a critical need to enhance the understanding of the failure mechanisms. Three premature failure projects were investigated. Recurring pumping, settlement and cracks are strongly related to poor Load Transfer Efficiency (LTE), which was obtained with a falling weight deflectometer. Cores were taken to examine the condition of the tie bars. The results from highway IH20 reveal that recurring failures occurred on the same slabs that had poor anchoring to the adjacent slabs. There was zero resistance on the pull-out test before the concrete was poured in 2009. Low LTEs of less than 40% were measured in 2010. Cores taken in 2010 revealed significant surrounding voids at the tie bar, indicating that the epoxy did not ever develop sufficient anchoring strength. The deflections at the joints were 3-5 times higher than those at the center slab. Similar failure mechanisms were observed on the IH35 and US75 projects that had poor LTE. ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|