Abstract
Today, concrete is known as the most widespread material in civil projects. Up to now, many research works have been conducted concerning determination of concrete durability using various methods including the measurement of electrical resistance in concrete. The present article is an attempt for application of a new method for measurement of electrical resistance of non-conductive materials which is well suited for concrete. To determine the effects of cement type and water to cement ratio on the corrosion phenomenon the electrical resistance method was used. For this purpose use was made of 7 different water to cement ratios and two types of cement (type 2 and type 5). Drawing the electrical resistance diagrams, it was shown that with increase in the water to cement ratio, corrosion rate increases in concrete. Also application of type 5 cement results in a higher strength resistance with respect to cement type 2. On the other hand by increase in the age of concrete specimens, they showed greater resistance to the corrosion attacks.
Highlights
Concrete is known as one of the inexpensive and widely used materials in the construction industry
In this research the test frequency was always kept as 1 kHz and the cement paste was of Portland cement type I from Abyek –Qazvin (Iran) which had a W/C ratio equal to 0.4
The test is performed in this way that after turning on the device and preliminary checking the plate’s electrical resistance and preparation of cement paste with a water to cement ratio of 0.4, the concrete specimen is removed from the water and is dried by a dry cloth for 30-60 seconds, the plates are smeared with cement and the concrete specimen is kept between the plates and the contact between plates and specimen was examined and ensured by hand
Summary
Concrete is known as one of the inexpensive and widely used materials in the construction industry. The basis of concrete electrical resistance is dependent on fluid permeability and ions emission through capillary tubes and related concrete voids and ionic and textural structure of materials [3]. Medeiros et al considered the effect of using different types of cements with different water to cement ratios on the concrete electrical resistance. The research have shown that by passing of time and increase in cement hydration, the amount of concrete electrical resistance in specimens increases. The researchers attribute this to reduced connections between the pores in concrete and reduction in the concrete electrical conductivity [16]. In this article we would investigate the relation between the electrical resistivity and the permeability by the cube shaped concrete specimens
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