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- W2170662148 abstract "Using lightweight concrete in bridge decks and girders can reduce the dead load carried by the superstructure and substructure, thus allowing for longer spans and/or smaller members. As part of a larger study focusing on the structural performance of lightweight high-performance concrete (LWHPC), researchers at the U.S. Federal Highway Administration fabricated 12 precast/prestressed LWHPC bridge girders. This paper describes the preliminary results of the first 20 out of 24 total girder tests used to evaluate the development length of prestressing strand in LWHPC. These tests are significant because of the paucity of development length test data for this type of concrete. Three different concrete mix designs were used in the girders. The mix designs included partial replacement of the coarse aggregate with lightweight aggregate, resulting in concrete equilibrium densities in the range between conventional lightweight and normal weight concrete. Variables investigated included strand size, number of strands, amounts of shear reinforcement, lightweight aggregate type, and concrete strength. The 28-day cylinder compressive strengths of the concretes in the girders ranged from 7.4 to 10.5 ksi. The preliminary test results have been compared to U.S. bridge code design equations. The end result of the study will be the development of recommend changes to the AASHTO LRFD Bridge Design Specifications relevant to LWHPC." @default.
- W2170662148 created "2016-06-24" @default.
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- W2170662148 date "2010-01-01" @default.
- W2170662148 modified "2023-09-27" @default.
- W2170662148 title "FHWA Research Program on Lightweight High-Performance Concrete - Development Length of Prestressing Strand" @default.
- W2170662148 hasPublicationYear "2010" @default.
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