Amin Daghighi - Research Assistant Construction Materials Institute University of Tehran, Iran,
Ali Nahvi - B.Sc. Student of Engineering Science Faculty of Engineering Science University of Tehran
Siavash Habibi - B.Sc. Student of Civil Engineering Faculty of Civil Engineering University of Tehran, Iran,
Mohammad Shojaeih - B.Sc. Student of Civil Engineering Faculty of Civil Engineering University of Tehran, Iran

In the environment that contains chloride, the rate in which the chloride permits for the concrete is an effective element that affects the service life of the concrete structures. One procedure for finding the corrosion of the concrete is electrical resistivity investigation. The target for this test was to investigate the effect of different admixture on the electrical resistivity. The cements ingredients were Portland cement blended with fly ash (FA), rice husk ash (RHA), blast furnace slag (BFS), silica fume (SF) and zeolite (ZE). All of these materials were compared to a common type of Portland cement which is Type II. The result is that 16 mixtures were got (W/C=0.4). The test checked the altitude of visible electrical resistivity of mixtures of the concrete along with the addition of admixtures by the use of Wenner’s four electrode procedure. Higher amounts of contents of silica fume and zeolite reached us to higher electrical resistivity; and this amount of electrical resistivity were more than the amount of that in the other samples.

Fly ash, Rice husk ash, Silica fume, Zeolite and Electrical resistivity