What's included in the A3 manufacturing impact for a volumetric mixer fleet?

For a volumetric mixer fleet, the A3 manufacturing impact is modeled as a defined share of the fleet's total energy use, covering everything involved in loading, proportioning, and mixing concrete on-site.

Under NSF's Product Category Rule for ready-mixed concrete (NSF 1112-26), 30% of a volumetric mixer fleet's total energy use is allocated to A3 — regardless of whether delivery transportation (A4) is separately reported for your EPD. That A3 allocation covers:

• Energy used for loading, proportioning, and mixing the concrete
• On-site operational transportation (movement of the truck around the site itself, separate from the delivery trip to get there)
• Lubricants, engine oil, and other equipment consumables
• Wash water
• Treatment of manufacturing waste and packaging

A default material-loss assumption of 2% is also applied, unless you've provided documented, project-specific loss data — in which case your actual figures are used instead of the default.

Troubleshooting

You can reach Customer Support directly here: Submit a Support Ticket