ABSTRACT
In Portland slag cements the electrical conductivity was found to decline with increasing slag content. The following are average values [in (Q.m)~l] found in cements with different slag contents (wlc = 0.50, water-saturated pastes) (Hinrichs 1987):
The electrical conductivity of cement pastes, mortars and concrete may be increased by incorporating electrically conductive constituents into the mix. Especially effective in this respect are graphite powders or graphite fibers (Fu and Chung, 1996; Solotov et al, 1997). In laboratory experiments the electrical resistivity of a Portland cement paste (wlc = 0.55, cured for 28 d at RH = 30%) declined from 1.62 X 105 to 1.93 X 104 by adding 0.5% carbon filaments (per weight of the cement) to the mix (Fu and Chung, 1996).
