United States Department of Transportation
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Abstract:Much of the fundamental basis for the current lightweight concrete (LWC) provisions in the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications is based on research of LWC from the 1960s.(3) 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 yr has given rise to significant advancements in concrete mechanical and durability performance.
This document describes the results of shear tests on high-strength LWC prestressed girders that were conducted as part of an overall Federal Highway Administration (FHWA) research project on LWC. The FHWA test results are included in an internal database of shear tests with over 400 tests on LWC specimens available in the literature. (For sources, see Bibliography section NWC Sources for ACI-DafStb Database.) An analysis of the database was used to develop potential revisions to provisions related to LWC within section 5 of the AASHTO LRFD Bridge Design Specifications.(3) 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 nominal shear resistance.(1) The framework includes a proposed revision to the definition of LWC, a proposed modification factor relevant to LWC structural performance, and a proposed revision to the resistance factor for LWC in shear.
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