Percolation effects in the electrical conductivity of porous cement mortar

Summary, in English

We have studied the electrical properties of cement mortars in the frequency range 10-3 to 107 Hz. The bulk d.c. conductivity was distinguished from electrode polarization effects at low frequencies as well as from a frequency dispersion at high frequencies. The bulk conductivity displays a dramatic variation with the water content of the samples. A percolation threshold can be seen at very low water contents. The conductivity varies as a power law of water content above the threshold. The power law exponent is consistent with the predictions of a percolation theory of Trugman and Weinrib.

• Författare: K. Brantervik; A. Berg; G.A. Niklasson; B. Hedberg; Lars-Olof Nilsson
• Publiceringsår: 1990
• Språk: Engelska
• Sidor: 549-554
• Publikation/Tidskrift/Serie: Europhysics Letters
• Volym: 13
• Issue: 6
• Länkar: http://dx.doi.org/10.1209/0295-5075/13/6/013
• Dokumenttyp: Artikel i tidskrift
• Förlag: EDP Sciences
• Ämne: Physical Sciences
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0295-5075