Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Low-frequency electrical conductivity of cement, clinker and clinker mineral pastes
AbstractThe electrical conductivity of pastes made of various types of portland cement and clinkers, as well as clinker minerals in the presence and absence of various admixtures was studied. In the investigated range of frequencies (100 Hz − 10 kHz) conductance increases after mixing with water to be followed by a steady decrease. This decrease in some cements is interrupted by a short, transient second increase. The time of this transient maximum (TM) of conductivity can be changed by temperature, grinding fineness, admixtures, carbonation, etc. The intensity of the TM can be reduced or the TM totally eliminated by the addition of gypsum. Clinker + gypsum mixtures show TM in case of a ‘critical’ gypsum content. The effect of accelerators (e.g., calcium chloride, sodium formate) and of retarders (e.g., citric acid) on the conductivity vs. time graphs is shown.
Low-frequency electrical conductivity of cement, clinker and clinker mineral pastes
AbstractThe electrical conductivity of pastes made of various types of portland cement and clinkers, as well as clinker minerals in the presence and absence of various admixtures was studied. In the investigated range of frequencies (100 Hz − 10 kHz) conductance increases after mixing with water to be followed by a steady decrease. This decrease in some cements is interrupted by a short, transient second increase. The time of this transient maximum (TM) of conductivity can be changed by temperature, grinding fineness, admixtures, carbonation, etc. The intensity of the TM can be reduced or the TM totally eliminated by the addition of gypsum. Clinker + gypsum mixtures show TM in case of a ‘critical’ gypsum content. The effect of accelerators (e.g., calcium chloride, sodium formate) and of retarders (e.g., citric acid) on the conductivity vs. time graphs is shown.
Low-frequency electrical conductivity of cement, clinker and clinker mineral pastes
Tamás, F.D. (Autor:in) / Farkas, E. (Autor:in) / Vörös, M. (Autor:in) / Roy, D.M. (Autor:in)
Cement and Concrete Research ; 17 ; 340-348
08.01.1987
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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