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Energetically modified cements (EMC) are a class of cementitious materials made from pozzolans (e.g. fly ash, volcanic ash, pozzolana), silica sand, blast furnace slag, or Portland cement (or blends of these ingredients). ==Classification and field-usage potential== An energetically modified cement is a cementitious material that has been produced using the EMC Activation process. The term "energetically modified cement" (abbreviated as "EMC" or "EMC cement") refers to a distinct class of cementitious materials.〔 There are several different energetically modified cements depending on the raw materials used. Although the term "energetically modified cement" implies that such compounds are cements, they are more accurately described as "cementitious materials". EMC cannot fully replace conventional Portland cement in concrete unless Portland cement itself is the raw material undergoing EMC Activation. Where raw materials other than Portland cement undergo EMC Activation, the resultant energetically modified cements are called "Alternative Cementitious Materials" or "Supplemental Cementitious Materials". Colloquially, energetically modified cements not made from Portland cement are sometimes describes as "Green Cements", because of the significant energy and carbon dioxide savings. As such, EMC may be viewed as a contributor to the emerging field of ecodesign. The usefulness of energetically modified cements depends on the performance characteristics required, based on the mechanical loads expected and the ambient environment. The most useful EMCs are those made from fly ash and natural pozzolans — on account of their relative abundance, the performance characteristics of the respective EMC, the relatively high Portland cement replacement ratios made available by EMC Activation using these raw materials, together with the associated energy and carbon dioxide savings. 〔 EMC products have been extensively tested by independent labs, including Caltrans and other concrete producers.〔〔(【引用サイトリンク】title=EMC Cement Presentation January 18, 2011 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Energetically modified cement」の詳細全文を読む スポンサード リンク
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