Rating System

LEED BD+C: New Construction

Rating System Version

v2 - LEED 2.1

Inquiry

City of Austin Resource Center for the Homeless High Volume Fly Ash Concrete Innovation Credit Introduction: We are proposing the following innovation credit for a project which will be using site-cast concrete for piers, caps, grade beams, slab on grade, floors, tilt-up walls, retaining walls, and site concrete. Will LEED award an innovation credit for the following: Intent: Diminish the life cycle CO2 emissions associated with site-cast concrete by replacing large quantities portland cement with fly-ash. Requirements: Replace 40% by volume portland cement with fly ash on average for all site-cast concrete used on the project including piers, caps, grade beams, slab, floors, tilt-up walls, retaining walls and site concrete. Submittals: Provide a spreadsheet with the following information for all site-cast concrete. Total volume of concrete placed for each mix design. Total percentage of cement for each mix design (portland + fly ash). Amount of Portland cement and fly ash used by volume in each mix design. Percentage of fly ash by volume of total cementatious material for each mix design. Compressive strength for each mix design. Weighted average percentage of fly ash by volume for all site cast concrete. This weighted average will be based on the amount (in cubic yards) of concrete placed for each mix design, and must be greater than or equal to 40% to achieve this credit. Design Approach: Work with local engineers and suppliers to optimize the mix design for each application with replacement of portland cement with fly ash, with a total project average of 40% replacement, while not increasing the total percentage of cement in the concrete design mix.