Pozzlock low-carbon cement passes concrete field trials in Australia | carboncredit.io

MCi Carbon's Pozzlock, a synthetic pozzolan made via mineral carbonation, has been validated in field trials hosted by Boral at Maldon Cement Works in New South Wales. The material replaces up to 5% of high-emissions clinker in concrete, with plans to test 10% replacement. Each tonne of Pozzlock is estimated to avoid about 0.5 tonnes of CO2 by cutting clinker use, on top of the CO2 mineralized during production. The trials moved from lab mortar testing to full-scale concrete truck batches (3.5 m3 each) that were pumped and finished into test slabs. Fresh concrete properties like slump retention, air content, and density matched conventional fly ash mixes. Early compressive strength and drying shrinkage were within expected ranges. The project involves Transport for NSW, UTS, and the SmartCrete CRC, aiming to validate low-carbon materials for infrastructure. This is a concrete step toward commercializing mineral carbonation for construction. The Myrtle demonstration plant in Newcastle, opened in June 2026, is scaling the technology from pilot to industrial deployment. For carbon markets and low-carbon procurement, this shows a pathway to verified emissions reductions in a hard-to-abate sector.