Investigation of Durability Pozzolanic Efficiency Factor by Means of Surface Resistivity Measurement

Abstract

Supplementary cementitious materials (SCMs) are used in concrete due to their properties such as reduction of cement consumption, reducing cost, enhancing concrete compressive strength, and boost durability of concrete against aggressive environment. In this paper, durability pozzolanic efficiency factor of four types of raw natural pozzolans (natural Zeolite, Trass, Tuff, and Pumice) and a type of artificial pozzolans (Rice Husk Ash) with respect to durability of concrete against corrosion of the reinforcement are determined and compared with each other. For this purpose, surface electrical resistivity of 17 kinds of diverse concrete mixture design are measured at two ages (28 and 90 days) using the Wenner four probes apparatus. The results show that natural Zeolite has the highest durability pozzolanic efficiency factor; Trass and Rice Husk Ash are in the second rate, also Tuff and Pumice are in the last place.