Regen GGBS
Ground granulated blast-furnace slag — a by-product of iron-making, ground to cement fineness and used to replace 20–80% of the Portland cement in a concrete mix. It is the single biggest lever most projects have on concrete carbon: this UK average declaration comes to 155 kgCO2e per tonne against 693 for Heidelberg’s own bulk CEM I, so every tonne swapped saves roughly four-fifths of the binder’s emissions, at the cost of slower early strength gain. Whiter than CEM I, so high-replacement mixes also cast paler. Now marketed under the evoBuild name; the declaration is for the Regen product.
Carbon and evidence
Product Evidence
Evidence currently held for the Heidelberg Materials UK product record.
Recorded Carbon Result
A1–A3 GWP-total per tonne, UK production-weighted average. For context recorded from documents read in full: Heidelberg’s own bulk CEM I EPD declares 693 kgCO2e/t, so as a like-for-like binder swap GGBS carries roughly a fifth of the carbon. It is a supplementary material — replacement rates in real mixes run 20–80%, and the concrete, not the binder, is what a project actually buys.
Indicator: GWP-total
A1–A3 covers raw-material supply, transport to manufacture and manufacturing. It is product-stage information, not a whole-life result.
Environmental Product Declaration
EPD recorded- Coverage
- Coverage not confirmed
- Declared unit
- 1 tonne of UK Average Regen GGBS
- Programme
- EPD Norge (The Norwegian EPD Foundation)
- Registration
- NEPD-8767-8422-2
- Standard
- EN 15804:2012+A2:2019, ISO 14025
- Valid until
- 2030-01-20
- Verification
- Third-party verified
UK average across the Port Talbot, Purfleet and Teesside grinding plants, year of study 2022.
Reported GWP Modules
Displayed as stored; modules are not added together here.
A1–A3
155 kgCO₂e
per 1 tonne of GGBS
Evidence Sources
EPD Norge (The Norwegian EPD Foundation)
Comparison Status
This result should be displayed for information only and not ranked against another product.
- • The represented product coverage is unknown.
- • The carbon result is not linked to an evidence source.
- • The EPD is not linked to an evidence source.
Evidence Gaps
- •EPD product coverage is not confirmed.
Design & Specification Notes
Qualitative notes for early design discussion. Not product-specific EPD evidence, and not a basis for numerical comparison.
Ground granulated blast-furnace slag — a by-product of iron-making, ground to cement fineness and used to replace 20–80% of the Portland cement in a concrete mix.
Typical Uses
- •Primary frame
- •Long-span elements
- •Load-bearing supports
Key Performance
High load-bearing capacity for primary frame.
Typical Service-Life Estimate
60 yearsGeneric estimate for early design discussion; confirm with the manufacturer.
Specification Actions
- •Confirm the current EPD covers the selected product, finish and manufacturing route.
- •Calculate transport distances for primary materials.
- •Document material reuse or reclaimed content percentages.
Indicative Health & Indoor Air
Specification
- Range
- evoBuild
- Finish
- Ground granulated blast-furnace slag cement replacement
- Country of manufacture
- United Kingdom