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nature : Kraft also known as slag cement. To dry granulated blast furnace slag (typically around 80%) plus 15% of gypsum (natural gypsum, calcined to 600-750 ° C water or natural anhydrous gypsum plaster, etc.) and a small amount of Portland cement clinker (generally not more than 8%) or lime (normally not more than 5%) or were grinding together again by grinding mixture of water has been hard cementitious material. Divided into six grade : 200, 250, 300, 400, 500, 600. In general civil and industrial construction, in particular the application on the ground and water projects, mass concrete, it is not appropriate for the role of alternate freezing and thawing by frequent water projects.
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