ALTERNATIVE CALCIUM SULFATE-BEARING MATERIALS AS CEMENT RETARDERS. PART I. ANHYDRITE

The rapid hardening of cement pastes due to the vivid reaction of C3A with water is usually prevented by adding a substance that acts as a retarder of the setting of cement. Substances that regulate the setting of cement, such as natural anhydrite, have attracted significant scientific interest during the past years. This article reports on the use of alternative calcium sulfate-bearing materials, notably anhydrite, as cement retarders in cement pastes of CEM-I and CEM-II types. The aim of the study is to inquire the extent of natural gypsum replacement by natural anhydrite. The result of the hydration process has been expressed by the setting time and the compressive strength development. The authors conclude that natural anhydrite is an alternative to gypsum, based on the setting and strength results. Anhydrite shows at least similar to gypsum behavior in compressive strength development, especially in the range of the optimum SO3 addition (about to 3.5%). The authors also note that the use of mixtures of gypsum and anhydrite seems to be advantageous for the precise control of setting time.

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• Corporate Authors:

  Elsevier

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  Kidlington, Oxford  United Kingdom  OX5 1GB
• Authors:
  • Tzouvalas, G
  • Dermatas, N
  • Tsimas, S
• Publication Date: 2004-11

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 2113-2118
• Serial:
  • Cement and Concrete Research
  • Volume: 34
  • Issue Number: 11
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Calcium sulfates; Cement paste; Compressive strength; Concrete curing; Gypsum; Hydration; Retarders (Concrete); Setting (Concrete)
• Uncontrolled Terms: Anhydrite
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00986444
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 8 2005 12:00AM