low-carbon-concrete
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Neocrete wants your concrete to cost less. The secret is in the ash.
The Auckland company is turning low-performing ash into a useful cement replacement. In Brunei, its first scale customer reports lower carbon and a US$6 saving on every cubic metre.
Loren Burnett Is Teaching Concrete to Borrow a Trick From the Sea
After five exits, the Colorado founder chose a harder material problem: turning microalgae, mineral chemistry and patient commercialization into concrete with a smaller carbon bill.
Verustruct
Verustruct is a New Haven-based construction-technology company building a gantry-less 3D printing system to make affordable, sustainable housing at scale. Founded by former SpaceX engineer Nick Callegari, its patent-pending translational slipform printer extrudes load-bearing walls with embedded mechanical, electrical, and plumbing systems, then scales itself up layer by layer, sidestepping the bulky gantry frames that cap the size of most additive-construction projects. Organized as a public benefit corporation, Verustruct aims to cut home construction cost by roughly half and emissions by around 40 percent.
Nicholas Callegari
Nicholas Callegari is the founder, chief engineer, and CEO of Verustruct, a New Haven climate-tech startup building gantry-less 3D printing robots that print entire load-bearing walls - plumbing, wiring, and insulation included. A former SpaceX structures engineer who helped design the Polaris Dawn spacewalk hardware on the Dragon spacecraft, he traded orbit for the housing crisis, betting that the same first-principles engineering used for spacecraft can cut home construction costs in half. He is a 2026 Forbes 30 Under 30 honoree in Manufacturing & Industry and a Yale School of Management MBA.