Low Carbon Concrete Initiative
The City of Portland’s 2016 Sustainable Supply Chain Analysis identified construction services as the top spend category contributing to the City’s supply chain greenhouse gas (GHG) emissions. Within construction services, concrete is one of the most GHG-intensive materials typically used on City construction projects. As a result, in 2019, after gathering both internal and external stakeholder input, the City established its Low Carbon Concrete Initiative to reduce the overall carbon intensity of the concrete mixes used on City projects. This Initiative will be carried out in phases, with the first few phases focused on gathering the data needed to inform the final phase of establishing concrete mix requirements that will lower the overall carbon intensity of concrete mixes used on City projects.
Phase 1: Environmental Product Declaration (EPD) Requirements
Beginning January 1, 2020, the City added the following requirements to the approval process for the supply of Portland Cement Concrete (PCC), including: Commercial Grade Concrete (CGC), Plain Concrete Pavement (PCP), and High-Performance Concrete/Structural Concrete (HPC) for City construction projects.
- All Portland Cement Concrete submitted to the City of Portland Materials Testing Lab for inclusion on the City’s (Pre)Approved Concrete Mix Design List will need to have a product-specific Type III Environmental Product Declaration (EPD) that is 3rd party verified and within its 5-year period of validity.
- All Portland Cement Concrete not on the City’s (Pre)Approved Concrete Mix Design List that are proposed for use over 50 yd3 on a City-owned or solicited construction project will need to have a product-specific Type III Environmental Product Declaration (EPD) that is 3rd party verified and within its 5-year period of validity.
Phase 2: Data Collection, including Lower Carbon Concrete Pilot Projects
The City, in collaboration with Oregon DEQ's Materials Management Program, will spend time in 2020 collecting baseline data on various concrete mixes used in the Portland Metro Area to better understand current mix designs, applications, and associated environmental impacts. This data will come from a variety of sources, including EPDs, historical project usage, and pilot projects.
In order to understand how lower-carbon concrete mixes perform compared to traditional 100% cement mixes, the City is performing pilot tests of different lower-carbon concrete mixes. First up is a pilot project testing low-carbon concrete mixes on sidewalk applications with the Portland Bureau of Transportation (PBOT). Work began on this pilot project in the Spring of 2020 and results of this pilot project are presented in the following case study. The Sustainable Procurement Program is currently working on starting another pilot test for another concrete application.
The Sustainable Procurement Program also funded the development of a Portland-area average EPD for mobile mix producers. Four mobile mix producers in the Portland area contributed to the EPD. A copy of the EPD can be found on the ASTM EPD website. Compared to the cost of an EPD for a stationary plant that may produce over 100 mixes, the cost per mix of an EPD for a mobile mix producer is significantly higher. Thus, the Sustainable Procurement Program pursued a local industry-average approach and invited any mobile mix producer supplying the Portland area to participate.
Phase 3: Establishing Global-Warming Potential (GWP) Thresholds
By June/July 2021, the City intends to publish maximum global-warming potential (GWP) thresholds for concrete on City construction projects (by type of concrete and strength class). Data collected throughout 2020 will inform a stakeholder engagement process to develop these thresholds in early 2021. The goal is to require concrete used on City construction projects to meet the GWP thresholds starting in 2022, so that over time, the City's concrete carbon footprint is reduced.
- Oregon Concrete EPD Program from Oregon DEQ and Oregon Concrete & Aggregate Producers Association
- Webinar: Local Government Policies to Drive Low-Carbon Concrete (February 4, 2020)
Clean Air Construction Regional Initiative
To improve the air quality in Portland Metro area, the City of Portland, Multnomah County, Port of Portland, Metro, and Washington County are working together to include Clean Air Construction Requirements in their construction contracts. You can find more information on the Clean Air Construction Regional Program website.
Contractor Code of Conduct
The City of Portland’s Sustainable Procurement Program is developing a Contractor Code of Conduct. The Code of Conduct will be used as part of a robust assessment of a vendor’s “responsibility” prior to contracting with the City of Portland. To be eligible to do business with the City, Contractors will agree to be responsible by following the principles and guidelines in the Code of Conduct that demonstrate social and environmental responsibility. "Responsibility" will be assessed through an associated Vendor Responsibility Questionnaire.
From October-December 2019, with the help of neutral consultants, the City gathered input from subject matter experts and stakeholders on initial drafts of the Contractor Code of Content, Vendor Responsibility Questionnaire, and related program elements. This work comprised the first round of stakeholder engagement. Feedback obtained during round one will be used to update the proposed program elements and draft documents. While the COVID-19 pandemic delayed work on this initiative, program staff plan to reengage on this work during Fall 2020 and hold additional rounds of stakeholder engagement. Updates will be posted to this page as they are available.
Sweatshop Free Apparel
The City's Sustainable Procurement Policy requires the City to purchase apparel products from manufacturers that comply with the City's Code of Conduct for Apparel Contractors [Attachment 1 of the Sustainable Procurement Policy]. The Code of Conduct requires that contractors, and their supply chain partners utilized to supply apparel to the City, comply with labor and health & safety standards that ensure workers are not subjected to sweatshop conditions.
Sweatshop Free Forms for Apparel Contractors
The City discloses the "cut and sew" factory locations where apparel items on City contracts are made. This information is available via the Sweatfree LinkUp database.