Case study · Nova Scotia · Cement Replacement
Casey Concrete: Magnumstone
For a precast concrete pour at Casey Concrete, MagnumStone blocks were manufactured using self consolidating concrete (SCC) with ΔC at a 5% dosage, reducing cement content by 7% and embodied carbon by 22%.
Mix
5%ΔC-CR
Volume
3 m³
GWP reduction
22%
Strength target
35 MPa @ 28 days
Casey Concrete Magnumstone block, NS · 5%ΔC-CR · 7% cement reduction · 22% GWP reduction
Project overview
alterBiota's ΔC admixture was used in Magnumstone concrete block production at Casey Concrete in Nova Scotia. The mix was designed using the Cement Replacement (CR) technique at a 5% ΔC dose, enabling a 7% reduction in cement content while targeting the same compressive strength performance.
- Volume placed
- 3 m³
- Application
- Magnumstone concrete block
- Specified strength
- 35 MPa @ 28 days
- Mix design technique
- CR (Cement Replacement)
- ΔC dose
- 5% biochar by weight of cement
- Cement reduction
- 7%
Fresh-state performance
ΔC was added as a liquid admixture during standard precast batching, requiring no equipment modifications. The self consolidating concrete (SCC) mix placed normally in the MagnumStone block molds.
GHG reduction analysis
Cement replacement plus biochar carbon storage delivered a 22% reduction in embodied carbon on this pour:
- Total GHG savings
- −181 kg CO₂ e/m³
- Cement reduction
- 7% vs control
- Net GWP vs control
- −22% vs control mix
Key benefits
- 22% embodied carbon reduction on a precast Magnumstone block pour
- 7% less cement while targeting the same 35 MPa specification
- Drop-in dosing in an existing precast plant, with no specialty equipment
- Demonstrates ΔC performance in self-consolidating concrete (SCC) applications
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