MetaSphere · Highly Reactive Calcined Clay
The sphere that changes everything
Every other metakaolin on the market arrives as a fine powder: dusty, low-density, and expensive to ship. MetaSphere arrives as a dense, free-flowing bead that pulverizes itself inside the mixer. Same reactivity. None of the handling headaches.
How it works
It works with your process, not against it
MetaSphere was engineered around one commercial reality: ready-mix producers will not change their batching process. So it doesn't ask them to.
Introduced during batching
Beads are added during the cement-loading phase by silo, pneumatic truck, or, for trials, a super sack lifted into the drum. No pre-grinding.
Ground inside the drum
The truck rotates on high for at least 90 revolutions. The dense spheres pulverize completely and disperse into the paste fraction.
Verified, then poured
Washing a fresh sample over a 325-mesh sieve confirmed zero intact spheres remained, confirming the clay is fully reacting.
Field Trial · Wrens Slab · May 8, 2026
Proven in the field, not just the lab
Thomson Concrete Materials, a family-owned producer serving Central Georgia for more than 75 years, batched three 5-yard loads to a 4,000 psi target, each replacing 20% of cement with a different MetaSphere form factor. All three produced workable, finishable concrete and gained strength over the control.
avg. 7-day strength gain
form factors workable
intact spheres on sieve
“Once the water was adjusted, the mix performed like normal concrete.”
Finishing contractor, Wrens Slab trial
Compressive Strength Performance
Historical control vs MetaSphere, 4000-psi mix
Reactivity & Chemistry
Chapelle values of 1,350–1,450
Like other pozzolanic SCMs, MetaSphere is low in calcium but rich in silica and alumina. It consumes the portlandite (Ca(OH)₂) released during cement hydration to form additional C-S-H and C-(A)-S-H binder phases.
At 20% replacement, available portlandite can be substantially reduced or fully consumed, yielding excellent compressive strength alongside a meaningfully lower carbon footprint than a straight-cement mix. Our wet-cleaned feedstock is nearly 100% kaolin, which is what drives reactivity this high.
Form Factors
One material, three formats
Every form factor we field-tested made excellent concrete. The spherical bead is the commercial star; the others exist for specific handling needs.
Sphere
The flagship. Dense, free-flowing, ultra-low dust. Loads by silo or pneumatic truck and grinds completely in the drum.
Cracked Sphere
Pre-fractured beads that grind in as effectively as full spheres while needing slightly less added water.
Pulverized Powder
Traditional fine powder for lab work and applications that call for immediate dispersion without drum grinding.
The Full Report
Read the complete Wrens Slab field trial
Mix designs, fresh-concrete properties, water adjustments per truck, break results, and estimated GWP, the full technical record, exactly as our ACI-certified technicians documented it. Tell us where to send it.
- Full mix-design and test-data tables
- 7-day compressive strength by form factor
- Estimated global warming potential (GWP)
Ready to try MetaSphere?
We'll help you plan a trial batch that fits your mix designs and plant.