Synthesis and Evaluation of Lightweight Concrete Research Relevant to the AASHTO LRFD Bridge Design Specifications: Identification of Articles for Further Evaluation and Potential Revision.

摘要

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. The purpose of this document is to give members of AASHTO Subcommittee on Bridges and Structures T-10 the opportunity to begin considering whether revisions to provisions related to LWC within Chapter 5 of the AASHTO LRFD Specifications are warranted. Five specific topics are described in this document where recent LWC research may be sufficient to warrant consideration of a revision to the AASHTO LRFD Specifications. For each topic, the current articles in AASHTO LRFD are described, some of the recent research efforts are mentioned, and then potential revisions are outlined. This document served as supplemental information in support of the discussion that occurred at the March 2012 T-10 meeting in Chicago, Illinois.