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The use of supplementary cementitious materials, such as fly ash and slag cement, as a partial replacement for portland cement helps designers and builders recycle industrial byproducts, achieve higher performance from concrete mixtures, and earn rating points toward LEED certification.
They discuss current methods of assessing sustainability; sustainable technologies related to concrete and concrete structures, such as carbon dioxide capture and storage technology, the use of supplementary cementitious materials and chemical admixtures, and high performance concrete structures; case studies of technologies; and future perspectives.
Descheneaux and Morrical will present "The Evaluation and Selection of Natural Supplementary Cementitious Materials for Blended Cements," and offer insight on methodologies for determining the potential that a pozzolan may have for use in blended cement.
For example, if some durability aspect of concrete containing CCA is reduced then it can be adjusted by the increased use of supplementary cementitious materials that may not result in any cost increase.
The two main substitutes for portland cement or supplementary cementitious materials are slag cement and fly-ash, Parries said.
Engineered cements from the raw materials to finished products are only possible given an improved understanding of the structure and properties of clinker phases, the influences of the calcium sulfate forms, and the effects of supplementary cementitious materials.
Based in Los Gatos, CA, Calera is a clean technology company which has developed an innovative process to capture the carbon dioxide emitted by coal or gas-fired power plants and convert it into calcium and magnesium carbonates for use in manufacturing carbon negative products such as sand, aggregate, supplementary cementitious materials, and cement, as well as fresh water.
The four-year effort targets formulation, through nanotechnology methods, of new types of reactive supplementary cementitious materials, plus development of process technology needed for large-scale SCM production based on locally available raw materials.