Materiales de Construcción, Vol 37, No 208 (1987)

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


https://doi.org/10.3989/mc.1987.v37.i208.856

Demetrio Gaspar-Tébar
ICCET/CSIC, Spain

José Luis Sagrera-Moreno
ICCET/CSIC, Spain

M. Francisca Bermejo-Muñoz
ICCET/CSIC, Spain

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.

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Copyright (c) 1987 Consejo Superior de Investigaciones Científicas (CSIC)

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