...used for large concrete blocks such as foundations for dams and huge structures. White Portland cementThe grey-green colour of Portland cement is due to Fe2O3 and MgO . The Fe2O3 content, which is normally around 3%, is reduced to 0.3% or less by selecting raw materials and preventing the inclusion of iron during the crushing process, making this a white cement. *Some terminology that mentions "white cement" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ダム,巨大構造物の基礎などの大塊コンクリート用として使われる。白色ポルトランドセメントwhite cementポルトランドセメントの灰緑色の原因はFe2O3とMgOのためである。通常3%程度含有されるFe2O3を,原料を選び,粉砕工程での鉄分の混入を防ぐことにより0.3%以下におさえ白色にしたセメント。… ※「white cement」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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