Our coverage of Environmental Product Declarations (EPDs) for ready mixed and manufactured concrete dates to 2013. The record of producers and their national associations responding to market signals calling for such documents continues to be exemplary.
过去的这个月看到第三个转折点在环保署的evolution from a target of green building practitioners, to data files for the Embodied Carbon Construction Calculator (EC3), to a priority of the Western Hemisphere’s biggest construction buyer, the U.S. federal government. The General Services Administration conducted a two-week survey of concrete producers, formally issued as “Request for Information Regarding Concrete: Environmental Product Declarations and Low Embodied Carbon Products.” The agency will now analyze responses to the nine-question survey seeking information on producers’ ability to provide mix-specific, cradle-to-gate Type III EPDs and insights on concrete exhibiting low embodied carbon characteristics. GSA will especially focus on zero- to high-slump mixes presented or certified as having an embodied carbon threshold lower than industry averages. The embodied carbon metric on the most widely recognized EPD type—prepared according to the ISO 14025 standard—is global warming potential, or kilograms of carbon dioxide equivalent.
The GSA survey is part of a larger effort surrounding White House Executive Order 14057, Catalyzing Clean Energy Industries and Jobs Through Federal Sustainability. It compels appropriate agencies to “promote use of construction materials with lower embodied emissions.” The order steers the U.S. Departments of Defense and Transportation, along with the Environmental Protection Agency, to action paralleling the GSA survey.
GSA，DOT和国防官员负责研究具体碳以驱动建筑材料或产品采购的碳，以寻找与现成混合和生产混凝土生产商相匹配的EPD作业的利益相关者。与经过认证的EPD计划运营商（例如National Ready混合混合混合混合协会和ASTM International）合作，现成的混合生产商已建立了五位数的声明库。由于国家混凝土砖石协会，国家预制混凝土协会和预制/预应力的混凝土研究所框架，他们的预制，预应力和建筑物或硬景观单位砌体方面也准备提交适用的公共或私人建筑项目的声明。
Federal agency interest in EPDs follows two other milestones, both rooted in the U.S. Green Building Council’s Greenbuild Conference. The event’s 2019 staging saw the debut of the open-access EC3 tool, the industry’s first database of digitized EPDs. Posted at the securewww.buildingtransparency.orgportal, EC3 fosters embodied carbon benchmarking, assessment and reduction among architects, engineers, owners, contractors, suppliers, manufacturers and policy makers.
It emerged after EPD had firmly taken hold in the market, owing to adoption of the Leadership in Energy and Environmental Design green building rating system. The LEED v4 version premiered at the 2013 Greenbuild and was especially noted for incentivizing supplier or manufacturer EPD submittals. Among producers who anticipated the LEED v4 Material and Resources credit were California’s Central Concrete Supply Co. and Angelus Block, which issued the first EPD for ready mixed and concrete masonry. Along with many other peers, they are prepared to field federal agency inquiries on high performance, low carbon concrete mixes.
Once the U.S. government absorbs the depth of EPD-backed ready mixed and manufactured concrete offerings at its disposal, the White House and agency heads should shift their focus from embodied to lifecyle carbon—an area where cast-in-place, precast and concrete masonry more than hold their own.