EVALUATION OF POZZOLANIC ACTIVITY BY THE ELECTRIC-RESISTANCE MEASUREMENT METHOD

Measurements of electric resistance and amount of consumption of portl andite were carried out in accelerated curing conditions by preparing pastes of Fine Ceraments, fly ash, silica fume, kaolin, acid clay, zeo lite and quartz activated with portlandite. Electric resistances of re active pozzolans showed sharp rises except that of kaolin, whereas tha t of as inactive material, quartz, showed no sharp rise. Electric resi stances are proportional to the consumptions of portlandite except for fly ashes. The electric resistance measurement method combined with p ortlandite consumption measurement is useful to the rapid evaluation o f pozzolanic activity.