Abstract— Magnetic iron oxide grains and/or micrograins embedded into concrete are suggested for pH-protection of concrete. To this aim a phenomenological formula for the change in pH of the water solution after contacting iron oxides was derived. It has a broader meaning because it refers to all materials for which surface electric potential varies with pH of the contacting solution. It may be used to design a suitable composition of the mortar. In addition, the important property of magnetite concentrate grains that they may increase compressive strength of the mortar is shown. In the study, all the mortar under consideration was made from Portland cement CEM I 42.5 R, natural aggregate – quartz sand fraction 0‑2 mm and magnetic material was magnetite concentrate supplied by Magnetite‑Grochow Sp. z o. o.
Keywords— compressive strength, concrete, magnetite concentrate, magnetite grains, pH value.
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