The effect of mineral admixtures on permeability, porosity and electrical resistivity of concrete

Document Type : Research Article

Authors

Department of civil engineering, Faculty of engineering, International Imam Khomeini university, Qazvin, Iran

Abstract

Evaluation of concrete durability is commonly performed by measuring its permeability, porosity and electrical resistivity. Moreover, using mineral admixtures in concrete mix design is one of the methods to enhance concrete durability. For this reason, in this paper, the effect of pozzolanic admixtures (silica fume, fly ash and zeolite) and limestone powder on permeability, porosity and electrical resistivity of 28-day and 120-day cubic concrete specimens with 15cm dimension was investigated. For concrete preparation, 5%, 10%, 15% and 20% of cement mass were replaced by the same amount of these admixtures. In this paper, the innovative method of the “Cylindrical chamber” was used for measuring concrete permeability. The results obtained revealed that except for the 28-day concrete specimen that 20% of its cement mass was replaced with limestone powder; other concrete specimens had lower permeability and porosity and higher electrical resistivity than the concrete specimen without admixtures. X-ray diffraction (XRD) test results also showed that pozzolanic materials produce more calcium silicate hydrates by consuming calcium hydroxide which results in the reduction of permeability and porosity and increase of electrical resistivity, compared with the concrete specimen without admixtures. In addition, a slight reduction in calcium hydroxide and calcium silicate hydrate peak intensities was observed for the concrete specimen containing limestone powder. This behavior showed that limestone powder enhances concrete durability, mainly due to filler and dilution effects.

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Main Subjects


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