CEMENT PASTE COLOURING IN CONCRETES

Achieving an appropriate durability for concrete demands, among other dosing requirements, the use of concrete with a minimum cement amount. However, no accurate method exists to calculate the among of cement in hardened concrete. This article reports on research undertaken to develop a method able to determine the quantity of cement through the application of selective colorings on concrete cylinders. The authors carried out chemical tests that give rise to colored compounds through a selective reaction with certain mineral species present in cement paste. In the case of carbonated concretes (pH approximately equal to 9), the reaction with potassium ferrocyanate dyes the cement paste a strong blue color that disappears when the concrete is treated again with a slightly more alkaline solution. Both in carbonated concretes and in young concretes with an alkaline reserve, the tannic acid dyes the cement paste dark brown.

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• Corporate Authors:

  Elsevier

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  Kidlington, Oxford  United Kingdom  OX5 1GB
• Authors:
  • Chinchon, S
  • Garcia, J
  • Lopez-Atalaya, M
  • Linares, A
  • Vera, R
• Publication Date: 2004-11

Language

• English

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 1987-1991
• 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: Carbonation; Cement paste; Colorants; Compressive strength; Concrete; Electron micrographs; pH value; Physicochemical properties; Tests
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00986430
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 8 2005 12:00AM