Resistencia química del hormigón. XXIX.—Contribución al estudio del sistema Cemento P-550-ARI hidratado-disolución de sulfato de magnesio

Abstract

In this Work, which is the following of the others, the performance of a portland cement of a high initial resistance (P-550-ARI) —with a calculated content (Bogue) of 39.2 – 25.7 – 9.9 - 12.0 and 6.9% of C₃S - C₂S - C₃A - C₄AF and CaSO₄ (II), respectively— is studied when it is submitted to the action of an magnesium sulfate solution [2.76 g/l of MgSO₄.7 H₂O <> 1.12 X 10^-2 moles/litre of SO₄ (II) <> 1,12 X 10^-2 moles/litre of Mg (II)] running across the beds of granulated cement, made with this hydrated cement cured during 7 and 28 days, determining: a) the evolution of the content on ions Ca (II), Mg (II) and SO₄ (II) on the taken diverse fractions of magnesium sulfate solution which have run across those beds, so as this of the pH and the conductivity. b) the variation in the amount of these ions that are forming the correspondents compounds, in the hydrated cement from the beds that have been submitted before and after to the action of the magnesium sulfate solution, c) the structural modifications undergone by the crystalline compounds of the hydrated cement from the beds submitted to the action of the magnesium sulfate solution, and d) the chemical and structural characteristics of the new solid phase formed on the magnesium sulfate solution which have run across the beds of cement.