Al₈Ca₁₂O₄₈Si₄Ti₈

Architectural potential

A serious mid-performance Portland-cement replacement with titanium-aluminate content modifying the calcium-silicate binder chemistry — 200 MPa of compression and eighteen per cent less embodied CO₂ against Portland puts it in direct conversation with low-carbon concrete for non-reinforced structural work. The 1 kg standard batch and 5 kg workshop maximum bring this into specifiable territory for pavilion-scale panel and slab work: prefabricated cladding panels, thermal-wall infills, floor toppings in retrofit carpentry, landscape walls and garden-room block, site-cast foundation plinths where the reinforcement requirement is light. The titanium content shifts the binder toward higher early strength and a whiter, more luminous finished surface than unfluxed wollastonite-family cements. Natural placements sit at pavilion wall, non-reinforced floor slab, prefab panel and plinth scale — the same pouring logic as Portland-family concrete, the same formwork, but with the kiln replaced by a lower-temperature bind-and-cure cycle. Supply-chain score is 1.0 and cost runs €9.60 per kilogram, modest by atlas standards. The caveat is the 1100 °C firing of the precursor phase: the kiln-free argument does not apply here — the energy and CO₂ savings come from reduced calcination, not from ambient curing, so the environmental case is real but partial, and the material competes with other low-carbon cement candidates on performance rather than on kiln elimination.

Material character

A white-grey body with a luminous edge that sets it apart from unfluxed wollastonite siblings — the titanium content shifts the fired surface toward a brighter, slightly cooler register, with the finest cast of warm undertone from residual iron in the alumina precursor. At 3.517 g/cm³ and 85×85×39 mm the slab sits firmly in the single-hand lift for short moves, a two-hand grip for sustained handling, close to a dense fired tile. Skin reads vitrified matte, finer-grained than a Portland body would finish, edging toward a partial surface glaze. Edges cold-cut with a clean, white-dusted kerf. Rings brighter than Portland concrete on the tap.