An Investigation of the Possibility of Estimating the Compressive Strength of Concrete by Using its' Electrical Resistance

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Different non-destructive tests have been proposed to control the quality of constructions which are being built and to evaluate the performance level of existing construction. Among these tests, determination of surface electrical resistance of the concrete by using a fully integrated 4-point Wenner probe is really beneficial due to its simplicity, low cost and good relationship with the results of various parameters related to the durability and strength of the concrete. This study examined the relationship between surface electrical resistance and compressive strength of the concrete. To achieve this goal, the concrete specimens with a ratio of water to cementations materials, grade of cement materials and different alternative cementations materials were made and they have been tested by compressive strength and the surface electrical resistance in different ages. In fact, the concrete surface electrical resistance is dependent on two main parameters including; the structure of cement paste pores and chemical properties of pore water. Due to the impact of the cement paste porosity on the concrete compressive strength, this study showed that the compressive strength can be carefully estimated indirectly by keeping  other parameters constant though  the surface electrical resistance in a specific concrete. However, in case of using alternative cement materials, regarding their actions, enough opportunity to do pozzolanic reactions of the second step is given to concrete in order to get reliable and accurate results.


Nondestructive tests, electrical resistance, Wenner machine, altrenataive cementations materials

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