Low-carbon concrete for data centers, without over-relying on SCMs

Data centers pour enormous volumes of concrete under aggressive embodied-carbon targets. The usual toolkit of Portland limestone cement and supplementary cementitious materials moves the GWP number. On site, pushing those levers too far often means poor finishability, delayed set and strength gain, and schedule risk on foundations, slabs, and site work that cannot slip.

Owners and producers need another lever that stacks with Type IL and SCMs without turning every pour into a specialty mix redesign.

A drop-in lever alongside SCMs

ΔC is a liquid biochar admixture, ASTM C494 Type A & F qualified as a water-reducing admixture. It is built to be scalable, flexible, and affordable without over-relying on SCMs: dose it into the mix you already run, keep environmental attributes with the producer and customer, and use moderate SCM levels while still reaching deep decarbonization.

That combination matters for data center programs that need both verifiable carbon cuts and predictable placement.

SCM compatibility: how deep can you go?

ΔC compounds with Type IL cement and SCMs. Relative to the NRMCA benchmark mix, moderate SCM with a mid-to-high ΔC dose can outpace a high-SCM mix that never adds biochar, and extreme combinations push past 60% reduction:

ΔC dose	SCM 18%	SCM 30%	SCM 50%
ΔC 0%	0% (baseline)	−22%	−40%
ΔC 2%	−19%	−30%	−49%
ΔC 4%	−27%	−38%	−57%
ΔC 6%	−35%	−46%	−65%

All values are relative to the NRMCA benchmark mix. Values include the combined decarbonization from Type IL cement, SCMs, and ΔC.

Dose by element: flexibility across the campus

Not every element needs the same carbon intensity or the same dose. Footings and foundations can take higher ΔC where structural schedules allow; slabs and sidewalks can stay at lower doses while still beating the benchmark:

Dose strategy	Footings (28 MPa)	Foundations (28 MPa)	Slabs (35 MPa)	Sidewalks (28 MPa)	Decarbonization
Low dose	2%	2%	2%	2%	−19%
Medium dose	4%	4%	2%	2%	−22%
High dose	6%	6%	4%	4%	−30%

All values are relative to the NRMCA benchmark mix. Values include the combined decarbonization from Type IL cement, SCMs, and ΔC.

One admixture program, tuned by element, instead of a single high-SCM recipe that slows every pour on the pad.

Schedule still matters

Deep embodied-carbon cuts only help if the concrete still finishes and gains strength on time. High-SCM mixes often trade carbon for hidden schedule and installation cost, a problem that is especially sharp on multi-pad data center programs. How ΔC stacks against that tradeoff is covered in Low-carbon concrete is painful for contractors.

• See how ΔC works and the full performance story.
• Model your own mix GWP with the ΔC estimator.
• Dig into Sand Replacement vs Cement Replacement when you choose how aggressively to cut cement.