Synthesis and Evaluation of Lightweight Concrete Research Relevant to the AASHTO LRFD Bridge Design Specifications: Potential Revisions for Definition and Mechanical Properties.

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 specific proposed revisions to provisions related to LWC within Chapter 5 of the AASHTO LRFD Specifications. A framework for addressing LWC in the specifications is proposed wherein the definition of LWC, the mechanical properties of LWC, and a reduction factor relevant to LWC structural performance is discussed. This document served as supplemental information in support of the discussion that occurred at the September 2012 T-10 meeting in Nashville, Tennessee.