混合セメントの化学抵抗性

概要

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The resisitivity of the blended cement mortars to acid or sulphate solution was measured by the change of appearance and the decrease of mechanical strength. The samples were immersed during the definite periods in acid or sulphate solution, after 7 days' water curing. The results were as follows:(1) Portland cement mortar was the most resistive of all the test cement to 1.8% H2SO4 solution.(2) Portland blast furnace cement caused the altered layer with large cracks in 3mm depth from surface, and in this layer, many needle shape crystals were found out. It was made clear by X-ray analysis that the altered layer contained cement bacillus in it and needle shape crystal was gypsum.(3) Portland cement, mixed with Beppu-white clay, was more resistive than the other cements to 2% MgSO4+3%NaCl solution. It seemed that it was ascribed to the action of soluble silica contained in the clay. Portland blast furnace cement showed remarkably expansive cracks on the surface layer, but the interior remained in unattacked state.(4) It would be desirable to cure in water more throughly, before immersing in aggressive solution, in order to increase resistivity of the blended cement mortar.
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