scmkek - Supplementary Cementing Materials School of Civil...

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1 Dr. Kimberly Kurtis School of Civil Engineering Georgia Institute of Technology Atlanta, Georgia Cement Hydration Supplementary Cementing Materials Kimberly Kurtis School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta, Georgia 1 PCA is a good resource on SCMs PCA CD038, 2002
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2 What are Supplementary Cementing Materials? ± AKA “mineral admixtures” or “supplementary cementitious materials” or “SCMs” (for cool cats) ± SCMs are a class of mineral-based materials possess pozzolanic reactivity and/or latent hydraulic reactivity Pozzolan – a siliceous or alumino-siliceous material that, in finely divided form and in the presence of moisture, chemically reacts at ordinary temperatures with calcium hydroxide released by the hydration of Portland cement to form compounds possessing cementing properties A hydraulic cement reacts chemically with water to form compounds (hydrates) that have cementing properties – e.g. Portland cement What are Supplementary Cementing Materials? ± Reactive materials which are used as partial replacement (generally by weight) for portland cement water-to-cement ratio w/c = m water /m cement water-to-cementitious materials ratio w/cm = m water /(m cement + m SCMs ) ± A component in “Blended cements”, where portland cement and SCMs are combined together as 1 product; These are currently more common in Europe and South America than in the US. ± Materials which can improve strength, workability, and durability ± Generally are less expensive than cement
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3 SCMs are GREEN ± Reduce energy consumption and CO 2 emissions when used as partial replacement for cement ± Productive use of industrial waste which may be landfilled ± Can improve concrete durability ± Contractors can derive benefits from having projects LEED (Leadership in Energy and Environmental Design) certified through the use of SCMs and other sustainable construction practices ± There are also some financial benefits to green construction New Home for Georgia Tech’s Business School is Green ATLANTA (September 19, 2003) -- Georgia Tech will save money and faculty and students will breathe easier in Georgia Tech’s new Management building - only the second building in Georgia to be certified as a Leadership in Energy and Environmental Design (LEED) Silver green building, a U.S. Green Building Council rating system. This cornerstone project of Technology Square Georgia Tech’s new multipurpose complex in the heart of Midtown Atlanta, achieved the prestigious LEED Silver certification, the second level of the four-level rating $CMs are GREEN ± Financial incentives are now available to contractors and owners to reduce CO 2 emissions during concrete construction. ± One such carbon dioxide offset program, Cool Climate Concrete (C3), offers $0.50 per metric ton CO 2 offset.
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scmkek - Supplementary Cementing Materials School of Civil...

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