“Cement-free” does not mean binder-free: C-Crete Technologies’ concrete replaces Portland cement with a proprietary binder. The company says its material has been used in commercial building work in Seattle and at San Francisco International Airport (SFO), with project-specific compressive-strength results above 5,000 psi. Those figures are company-reported, not independent proof that every formulation performs the same way.
What “cement-free concrete” means
Concrete needs a binder to hold its other ingredients together. In C-Crete’s case, “cement-free” means the mix does not use Portland cement; it does not mean the concrete contains no binding material. The company describes a proprietary binder and has reported formulations using different mineral feedstocks, including basalt and zeolite.
Those formulations should not be treated as one interchangeable recipe. A strength result for one project or mix does not establish the performance of another.
Where C-Crete says its concrete has been used
Seattle adaptive-reuse project
C-Crete says its first installation at 7200 Woodlawn, an adaptive-reuse building in Seattle, took place in May 2023. The company reports that approximately 60 tons of its proprietary binder went into the foundations and shear walls, and that the concrete achieved compressive strength above 5,000 psi. These project details come from C-Crete’s project page; BGR also reported the commercial-building use on July 27, 2024, describing the material as cement-free concrete (BGR’s report).
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Basalt-based Seattle mix
For a separate Seattle project, C-Crete describes a basalt-based mix and reports that approximately 20 tons were used. The company says this formulation exceeded 5,000 psi at 28 days. That is a result for the basalt-based project, not a substitute for the test result reported for 7200 Woodlawn. See C-Crete’s basalt project page.
Zeolite project
C-Crete also describes a distinct zeolite project in November 2023, involving approximately 20 tons. The company reports compressive strength above 5,000 psi. The page does not make this result interchangeable with the basalt mix’s stated 28-day result. See C-Crete’s zeolite project page.
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San Francisco International Airport
C-Crete says approximately 35 cubic yards of its Portland-cement-free concrete were poured into two corridors at SFO in November 2024. For that mix, the company reports a 28-day compressive strength of 6,290 psi. This is a separate project and formulation from the Seattle installations. See C-Crete’s SFO project page.
What the strength figures do—and do not—show
Compressive strength measures how much compressive load a concrete specimen withstands under specified test conditions. The figures C-Crete reports are useful as project-specific indicators, particularly where the company identifies a test age, as it does for the basalt mix and SFO mix at 28 days. They do not, on their own, establish suitability for every structural use or show how all of the company’s mixes compare.
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A building decision requires more than a headline strength number. For a meaningful comparison, engineers and owners would need to consider the exact binder chemistry and feedstock, test age and method, durability evidence, applicable standards and verification, the intended application, and performance in service. The company project pages describe deployments and reported results, but they are not independent verification of structural compliance or long-term field performance.
Why replace Portland cement?
Reducing emissions associated with Portland cement is the motivation behind many alternative binders. C-Crete presents its concrete as a lower-carbon alternative, but a credible emissions comparison depends on the mix, the chosen baseline, the lifecycle boundaries and independent verification. The project information cited here does not establish an independently verified lifecycle-emissions figure that can be applied across these projects or used to claim a universal percentage reduction.
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That distinction matters: evidence that a cement-free mix has been placed in a building or reached a reported compressive-strength value is not, by itself, evidence of a particular lifecycle-emissions saving.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to check before specifying an alternative binder
- Exact formulation: Identify the binder and feedstock; do not assume basalt-, zeolite- and other mixes share properties.
- Application-specific performance: Review strength at the relevant test age alongside durability data for the conditions the concrete will face.
- Standards and verification: Establish which standards apply and who has verified compliance for the intended structural use.
- Project evidence: Distinguish a reported installation from independently documented performance over time.
- Environmental accounting: Request a lifecycle comparison that identifies its baseline, scope and verification rather than relying on a general low-carbon label.
C-Crete’s pages document company-reported commercial use, including structural elements in Seattle and corridor pours at SFO. They do not establish a complete independent comparison of emissions or long-term performance across its formulations.
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