Relationship Between Resistivity, Diffusivity and Microstructural Descriptors for Mortars with Silica Fume

This article reports on a study of the relationship between resistivity, diffusivity, and microstructural descriptors for mortars with silica fume (SF). Mortars with a sand-to-cement ratio of 3 and water-to-cement ratio of 0.5 were made with 0% and 10% SF. Resistivities were measured with alternating current impedance spectroscopy (ACIS). Microstructure was investigated with mercury intrusion porosimetry. The study showed a relationship relating hydration time to the product of resistivity and diffusivity. For both mortars, resistivities increase and diffusivities decrease as hydration times increase. Furthermore, the product of resistivity and diffusivity was related to porosity, mean and threshold pore diameters. The influence of silica fume in refining the pore structure was marked. SF results in higher resistivities and diffusivities, but only after 7 days of hydration.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
• Authors:
  • Tumidajski, Peter J
• Publication Date: 2005-7

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 1262-1268
• Serial:
  • Cement and Concrete Research
  • Volume: 35
  • Issue Number: 7
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Diffusivity; Electrical impedance; Electrical resistivity; Hydration; Microstructure; Mortar; Pore size distribution; Silica fume; Spectroscopy
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01002036
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 19 2005 10:32AM