| Title | Splice Length of Prestressing Strand in Field-Cast UHPC Connections |
|---|---|
| Record ID | 75015 |
| Personal Name Creator |
Graybeal, Benjamin A. |
| Corporate Creator | United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development |
| Publisher | United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development |
| Publication Date | 20140201 |
| Language | English |
| Abstract | The development length of reinforcements embedded into ultra-high performance concrete (UHPC) can be significantly shorter than the lengths normally associated with conventional concrete. Shortening the development length of prestressing strand can allow for a redesign of some structural systems, including spliced girder and continuous-for-live-load bridges. Ultra-high performance concrete (UHPC), when used in field-cast connections between prefabricated bridge elements, can create robust connections which emulate monolithic components. This study investigated the development length of 0.5 and 0.6 inch (12.7 and 15.2 mm) diameter untensioned prestressing strands embedded in steel fiber and PVA fiber reinforced UHPC. The volumetric fiber content was 2 percent. A novel tension test method allowed for replication of the tension-tension stress state that would occur when two strands are lap spliced within a connection between two linear elements. The results suggest that, for the steel fiber reinforced UHPC, the 0.5 inch (12.7 mm) diameter strands can be fully developed within 20 inches (0.51 m) and the 0.6 inch (15.2 mm) diameter strands can be fully developed in approximately 24 inches (0.61 m). The 0.5 inch (12.7 mm) diameter strands can be fully developed in the PVA fiber reinforced UHPC in approximately 36 inches (0.91 m). This report corresponds to the TechBrief titled “Splice Length of Prestressing Strand in Field-Cast UHPC Connections” (FHWA-HRT-14-041). |
| Public Note | The research discussed herein was completed by Benjamin Graybeal who leads the FHWA Structural Concrete Research Program at the Turner-Fairbank Highway Research Center. Assistance in the fabrication of test specimens was provided by laboratory support contract staff employed by Global Consulting, Inc. and working at TFHRC under contract DTFH61-07-C-00011. |
| Rosap ID | dot:50251 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/50251 |
| TRT Terms | Ultra high performance concrete; Fiber reinforced concrete; Prestressing; Prestressed concrete; Adhesive bond strength; Cast in place concrete; Girders |
| General Subjects | Ultra-high performance concrete; UHPC; fiber-reinforced concrete; prestressing strand; development length; bond stress; field-cast; spliced girder |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1748909 |
| Contract Number | DTFH61-07-C-00011 |
| Report Number | FHWA-HRT-14-047 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/75000/75000/75015/FHWA-HRT-14-047.pdf |
| Format | |
| Database | NTL Digital Repository |