Howdy, carbon heads, I’m looking for resources or people to talk to about glass’s carbon footprint, and what’s coming for reducing that. Also use of ground glass as a pozzolan or aggregate. Thanks!
UL SPOT has quite a few EPDs of glass in various formats, window glass, fiberglass insulation, etc. which are in line with the interests of the building crowd. For things like fiberglass reinforcements, there’s an industry study from Europe that goes into nice detail - https://www.glassfibreeurope.eu/sustainability/life-cycle-inventory-impact-assessment/
In terms of reducing the carbon footprint, from an insulation and reinforcements point of view, some of the strategies include changing the chemical binder on insulation, increasing recycled glass cullet content, general productivity improvements & product optimization, and probably the biggest opportunity, increased use of renewable electricity, including conversion of natural gas furnaces to electric.
If there are questions related to our products, happy to answer as best I can.
Program Leader | Product Stewardship & Sustainability
Thank you, Cheryl! Can we arrange a 30 min. call? Please use firstname.lastname@example.org
There is a full LCA study on glass pozzolan, here’s a summary, but you could contact RIT to get the full report - https://www.rit.edu/affiliate/nysp2i/sites/rit.edu.affiliate.nysp2i/files/docs/resources/Urban_Mining_Northeast_Evaluates_Environmental_Impact_of_Pozzotive_in_Cement.pdf
What do you see coming to reduce glass’s carbon footprint? Other than the EPDs @cheryl.smith listed, are there new products on the horizon that will do better?
This is the link to the AGC web site information about their program tracking the carbon footprint of their glass products. Might be useful for what you are looing for.
Linking here to Climate Earth LCA for Pozzotive ground-glass pozzolan (GGP) out of Beacon Falls, CT plant: https://pozzotive.com/wp-content/uploads/2020/10/Pozzotive-Life-Cycle-Assessment.pdf. 42% GWP reduction (compared to all-cement control) for 9k psi US Concrete mix designs replacing 50% of cement w/ GGP.
ASTM C1866 Std. Spec. is here: www.astm.org/Standards/C1866.htm
One ACI Materials Journal article on NYC sidewalks w/ 20%-40% GGP cement replacement alongside FA + slag mixes: www.concrete.org/publications/internationalconcreteabstractsportal/m/details/id/51716716
Also, Saint Gobain aims to increase its window glass circularity/recycling in France from 30% to 50% by 2025, referencing that a metric ton of recycled glass/cullet saves 300 kilos of CO2.