Abstract :
In this study, 80 V AC current is applied to 300 dosaged concretes whose water/cement ratios are 0.45, 0.55, 0.65 and 0.70. Admixtures having different hyper plasticizer ratios (0.5 %, 1 % and 1.5 %) and admixtures having constant water/cement ratio (0.55) at 300 dosaged levels were prepared. Electrical current was applied to the fresh concretes in the electrically isolated molds whose sizes are 10cm x 10cm x 35cm. The measurements were done at room temperature. As a result of measuring internal temperatures of concretes, the differences between final setting time with and without electric current application on the specimens were investigated. The effects of Alternating Current (AC), water/cement ratio, hyper plasticizer ratio on final setting time, 1 day compressive strength and 28 day compressive strength are investigated. It is aimed to shorten the duration of final setting time through adding hyper plasticizer in a certain rate to the concrete and application of AC current. As a result, adding little hyper plasticizer (0.5 %) and application of 80 V AC electrical current to the concretes shorten the setting time without critical compressive strength loss.
