423-F Sustainable Prestressed Concrete

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Presentation transcript:

423-F Sustainable Prestressed Concrete Update for 423 April 13, 2015

Provide an overview of the 423-F document Update document status Review TG discussion from yesterday Present possible paths forward Questions/comments/discussion from 423

Sustainability Guide for Prestressed Concrete Overview of 423-F document Sustainability Guide for Prestressed Concrete The recommendations made in this Guide are intended to provide an overview of the sustainability benefits and limitations of prestressed concrete. While local and overall sustainability benefits of prestressed concrete structures are reviewed, additional focus on materials and the less understood indirect benefits of prestressed concrete are documented. In addition, a resilience measure of prestressed concrete is provided through the Life Cycle Analysis (LCA) summary.

Sustainability Guide for Prestressed Concrete Overview of 423-F document Sustainability Guide for Prestressed Concrete Chapter 1: Introduction and Scope Chapter 2: Sustainability Benefits of Prestressed Concrete Chapter 3: Material Efficiency Chapter 4: Life-Cycle Assessment

Status of 423-F document Scope and outline presented to TAC in 2012 (?) Work has accelerated in the past year Draft distributed to TG members in January 2015. all four chapters 36 pages total primarily qualitative includes one quantitative example on material use Review of draft provided by TG members Thomas Kang, primarily editorial comments Emily Lorenz, primarily technical comments

Review of TG discussion Positive comments Concerns Good introduction to the terminology and concepts of life-cycle assessment Doesn't require waiting on 130 Highlights material efficiency benefits of prestressed concrete Will be beneficial for explaining sustainability to clients Comparison with RC is counter productive Possible redundancy/conflict with 130 documents Focuses on material efficiency, but neglects construction impacts Focuses on embodied energy, but neglects other sustainability metrics Meets the “greenwashing” definition

Possible paths forward Stay the current course Conduct a rigorous LCA for comparison Abandon document Reframe document Discuss material efficiency as one of many aspects of sustainability and provide citations/information on other aspects as well. (don’t cherry pick) Provide more detailed information and provide circumstances and limitations associated with the information. (avoid generalizations) Provide information for using prestressed concrete sustainably. (Teach, don’t promote)