Lightweight Concrete: Transfer and Development Length of Prestressing Strands

Greene, Gary; Graybeal, Benjamin A.; United States. Federal Highway Administration. Office of Infrastructure Research and Development

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Lightweight Concrete: Transfer and Development Length of Prestressing Strands

2019-02-01
By Greene, Gary ; Graybeal, Benjamin A.

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English

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Creators:

Greene, Gary ; Graybeal, Benjamin A.

Greene, Gary ; Graybeal, Benjamin A. Less -
Corporate Creators:

United States. Federal Highway Administration. Office of Infrastructure Research and Development
Corporate Contributors:

United States. Federal Highway Administration. Office of Research, Development, and Technology ; Turner-Fairbank Highway Research Center

United States. Federal Highway Administration. Office of Research, Development, and Technology ; Turner-Fairbank Highway Research Center Less -
Subject/TRT Terms:

[+]

Bridge Design Concrete Bridges Lightweight Concrete
Publication/ Report Number:

FHWA-HIF-19-018
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Federal Highway Administration. Office of Infrastructure Research and Development
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 transfer length measurements and development length tests on highstrength LWC prestressed girders that were conducted as part of an overall FHWA research project on LWC. The FHWA test results are included in a strand bond database with over 250 LWC specimens and 350 NWC specimens available in the literature. An analysis of the database was used to develop potential revisions to provisions related to LWC and NWC within Section 5 of the AASHTO LRFD Bridge Design 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 expressions for strand transfer length and development length. The framework includes a revision to the definition of LWC and a revised expression for predicting concrete elastic modulus.
Format:

PDF
Alternate URL:

https://www.fhwa.dot.gov/publications/research/infrastructure/structures/bridge/19018/index.cfm
Collection(s):

Federal Highway Administration
Main Document Checksum:

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urn:sha256:ff591ca7fccd91ae57c5ed17f31e969e4a2363d096a802d635a71753fc6a7f82
Download URL:

https://rosap.ntl.bts.gov/view/dot/40078/dot_40078_DS1.pdf
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Lightweight Concrete: Transfer and Development Length of Prestressing Strands

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