Solidia Technologies, Inc. (Solidia) is working to create an energy-efficient, carbon dioxide (CO2)-consuming inorganic binder based on a patented synthetic Wollastonite material known as Solidia CementTM (SC) that will act as a suitable substitute for Portland Cement (PC). The process developed by Solidia utilizes a binding phase based on carbonation chemistry rather than conventional hydration chemistry (i.e., curing by adding water). During CO2-curing, SC was demonstrated to consume 250kg of CO2 per metric ton SC produced (30% by weight). The project initially started with an investigation of theeffect of temperature, pressure, and particle size on the carbonation reaction rate and yield. Solidia further optimized the curing process at bench scale by analyzing the effect of water distribution and drying on the curing process. Solidia then successfully produced several full-scale product forms (railroad ties, concrete block, and hollow core slab) that exceeded performance standards. Solida is currently performing commercial trials at several precast concrete manufacturers to demonstrate feasibility of retrofitting to existing facilities at comparable production economics.
This project focuses on developing a process that uses a CO2-consuming inorganic binder as a substitute for Portland cement in concrete. Commercial uses for this process will store CO2 with a net reduction of greenhouse gas emissions. Specifically, this project is demonstrating the feasibility of commercial application of SC and the reduction of greenhouse gas emmisions that can be realized compared to Portland cement. An added benefit of SC is that it can be produced in existing PC kilns with up to 30% reduced CO2 emissions and energy consumption. In sum, SC has the potential to reduce the CO2 intensity (tons of CO2 per ton PC) of production and curing by as much as 60% compared to PC.
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