APPLICATION OF A MICROWAVE IMPULSE TECHNIQUE TO THE MEASUREMENT OF FREE WATER CONTENT IN EARLY HYDRATION STAGES OF CEMENT PASTE

Reliable information on the development of the material properties of concrete during its curing process is crucial. The transition from the clay-like phase to the hardened phase is not sharp, and it is not early to identify exactly when the material is really hardened and can accept a mechanical load. This article reports on a study that designed and tested a microwave impulse method for the monitoring of residual moisture content in early hydration stages of cement paste. The authors undertook a number of different experiments: determination of the times of beginning and end of setting and of the course of bending strength, compression strength, and Young's modulus; and hydration heat production during the early hydration period. The results show that the fastest decrease of residual moisture content roughly agrees with the early stages of the hardening process, i.e., with the time period between the end of setting and the moment when first measurable values of mechanical parameters (bending strength, compressive strength, and Young's modulus)are obtained. The development of hydration heat production exhibits both qualitatively and quantitatively similar features, but the very fast increase of hydration heat production is observed a little sooner than the beginning of the hardening process, after 4 hours.

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• Corporate Authors:

  Elsevier

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• Authors:
  • Pavlik, J
  • Tydlitat, V
  • Cerny, R
  • Klecka, T
  • Bouska, P
  • Rovnanikova, P
• Publication Date: 2003-1

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 93-102
• Serial:
  • Cement and Concrete Research
  • Volume: 33
  • Issue Number: 1
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Calorimeters; Cement paste; Compressive strength; Flexural strength; Heat of hydration; Hydration; Mechanical properties; Microwaves; Young's modulus
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00986463
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 8 2005 12:00AM