Amazon & Brimstone Advance Lower-Carbon Cement Collaboration - CleanTechnica

Amazon and Brimstone have announced promising initial test results for Brimstone’s lower-carbon Ordinary Portland Cement (OPC), intended for use in concrete construction. The tests, conducted with Amazon’s concrete consultants, evaluated key properties such as workability and compressive strength based on Amazon’s slab mix designs. Brimstone’s OPC met ASTM C150 standards and performed comparably to conventional cement currently used in Amazon buildings. Encouraged by these outcomes, Amazon has signed a commercial agreement to reserve annual volumes of Brimstone’s OPC and supplementary cementitious materials (SCM) from Brimstone’s upcoming Oakland, CA plant. Building on this success, Amazon and Brimstone plan to conduct more extensive testing in 2025 and 2026 to assess durability, sulfate resistance, aggregate reactivity, and other critical properties across a wider range of concrete mixes and applications. Brimstone’s CEO highlighted that their process produces industry-standard cement at competitive prices, facilitating fast market adoption due to compliance with