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Calorimetry of portland cement with silica fume and gypsum additions

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Abstract

The use of active mineral additions is an important alternative in concrete design. Such use is not always appropriate, however, because the heat released during hydration reactions may on occasion affect the quality of the resulting concrete and, ultimately, structural durability. The effect of adding up to 20% silica fume on two ordinary Portland cements with very different mineralogical compositions is analyzed in the present paper. Excess gypsum was added in amounts such that its percentage by mass of SO3 came to 7.0%.

The chief techniques used in this study were heat conduction calorimetry and the Frattini test, supplemented with the determination of setting times and X-ray diffraction. The results obtained showed that replacing up to 20% of Portland cement with silica fume affected the rheology of the cement paste, measured in terms of water demand for normal consistency and setting times; the magnitude and direction of these effects depended on the mineralogical composition of the clinker. Hydration reactions were also observed be stimulated by silica fume, both directly and indirectly – the latter as a result of the early and very substantial pozzolanic activity of the addition and the former because of its morphology (tiny spheres) and large BET specific surface. This translated into such a significant rise in the amounts of total heat of hydration released per gram of Portland cement at early ages, that silica fume may be regarded in some cases to cause a synergistic calorific effect with the concomitant risk of hairline cracking. The addition of excess gypsum, in turn, while prompting and attenuation of the calorimetric pattern of the resulting pastes in all cases, caused the Portland cement to generate greater heat of hydration per gram, particularly in the case of Portland cement with a high C3A content.

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Authors and Affiliations

  1. Civil Engineering Department, Faculty of Engineering, UNCPBA, Olavarría, Argentina, B7400JWI, Avda. del Valle 5737

    V. Rahhal & O. Cabrera

  2. Eduardo Torroja Institute for Construction Science, CSIC, Madrid, Spain, 28033, Serrano Galvache n° 4

    R. Talero & A. Delgado

Authors
  1. V. Rahhal
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  2. O. Cabrera
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  3. R. Talero
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  4. A. Delgado
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Correspondence to V. Rahhal.

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Rahhal, V., Cabrera, O., Talero, R. et al. Calorimetry of portland cement with silica fume and gypsum additions. J Therm Anal Calorim 87, 331–337 (2007). https://doi.org/10.1007/s10973-005-7324-1

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