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Rapid Development of Alkali-Activated Cement Using Design of Experiment

Speaker: Alexander J. Moseson, Drexel University
Series: CEE Departmental Seminars
Location: Bowen Hall Auditorium
Date/Time: Monday, February 7, 2011, 4:30 p.m. - 6:00 p.m.

Abstract:

Alkali-activated cements are an attractive alternative to Portland cement with comparable performance and cost, but little CO2 emission. However, challenges to their research and commercialization include variability amongst raw materials, and non-linear relationships between formulation and performance. Progress will be presented on the rapid fundamental and practical development of a concrete comprising ground granulated blast furnace slag, activated by soda ash (sodium carbonate), with up to 66% fine limestone. Mixture Design of Experiment (DOE) was utilized, with analysis of compressive strength, modulus of elasticity, hydraulic properties, cost, and CO2 production. This approach allows for rapid development of successful formulations, important for commercial application. Models were derived to understand the impact of mix design on performance and for optimization. Successful formulations are hydraulic and cure at room temperature, with strengths as high as 40.7 MPa at 3 days and 64.5 MPa at 28 days, and costs and CO2 production as low as ~ $33 USD/tonne and 16 kg/tonne for materials, respectively.