| Title | Lightweight Concrete: Development of Mild Steel in Tension |
|---|---|
| Record ID | 74946 |
| Personal Name Creator |
Greene, Gary; Graybeal, Benjamin A. |
| Corporate Creator | United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development |
| Corporate Contributor |
PSI, Inc. |
| Publisher | United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development |
| Publication Date | 20140101 |
| Language | English |
| Abstract | Much of the fundamental basis for the current lightweight concrete provisions in the AASHTO LRFD Bridge Design Specifications is based on research of lightweight concrete (LWC) from the 1960s. The LWC that was part of this research used traditional mixes of coarse aggregate, fine aggregate, portland cement, and water. Broad-based advancement in concrete technology over the past 50 years has given rise to significant advancements in concrete mechanical and durability performance. This document describes the results of tests on high-strength LWC splice beams that were conducted as part of an overall FHWA research project on LWC. The FHWA test results are included in a database of bond tests with over 200 tests on LWC specimens available in the literature. An analysis of the database was used to develop potential revisions to provisions related to LWC within Chapter 5 of the AASHTO LRFD Specifications. The framework for addressing LWC in the specifications that was proposed previously as a part of this research effort is applied to the design expression for development length of mild steel. The framework includes a proposed revision to the definition of LWC and a proposed modification factor relevant to LWC structural performance. |
| Public Note | This document was developed by research staff at the Turner-Fairbank Highway Research Center. Portions of the work were completed by PSI, Inc. under contract DTFH61-10-D-00017. Gary Greene of PSI, Inc. and Trine University, who is the lead contract researcher on FHWA’s lightweight concrete research efforts, and Ben Graybeal of FHWA, who manages the FHWA Structural Concrete Research Program, developed this document. |
| Rosap ID | dot:50228 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/50228 |
| TRT Terms | Lightweight concrete; Bridge design; Load and resistance factor design; Development; Splicing; Chemical bond strength |
| General Subjects | LWC; lightweight concrete; bridge design; LRFD design specifications; development length; splice length; bond strength |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1750017 |
| Contract Number | DTFH61-10-D-00017 |
| Report Number | FHWA-HRT-14-029 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/74000/74900/74946/FHWA-HRT-14-029.pdf |
| Format | |
| Database | NTL Digital Repository |