Electrical resistivity measurements in steel fibre reinforced cementitious materials
Artikel i vetenskaplig tidskrift, 2018

This paper reports results from experiments aimed at better understanding the influence of fibre dosage and fibre geometry on the AC frequency needed to determine the DC resistivity of cementitious materials containing steel fibres. Impedance spectroscopy and DC galvanodynamic measurements were performed on mortar prisms with varying fibre reinforcement to determine the matrix resistivity (related to ionic current within the pore solution) and composite resistivity (accounting for both ionic current and electronic current through the fibres). The results showed that adding steel fibres did not significantly affect the DC nor the AC matrix resistivity of the mortar prisms. However, the steel fibres yielded a drastic reduction of the frequency associated to the AC matrix resistivity from ∼1 kHz in plain mortar to ∼1 Hz in steel fibre reinforced mortar. These findings revealed the need to adequately adjust the frequency in AC resistivity measurements of steel fibre reinforced cementitious materials.

impedance spectroscopy

dielectric properties

cement-based materials

steel fibre reinforcement

Författare

Carlos Gil Berrocal

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Karla Hornbostel

Statens vegvesen

Mette Geiker

Norges teknisk-naturvitenskapelige universitet

Ingemar Lövgren

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Karin Lundgren

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Dimitrios Bekas

Panepistimio Ioanninon

Cement and Concrete Composites

0958-9465 (ISSN)

Vol. 89 216-229

Drivkrafter

Hållbar utveckling

Ämneskategorier

Materialteknik

Samhällsbyggnadsteknik

Styrkeområden

Transport

Building Futures

DOI

10.1016/j.cemconcomp.2018.03.015