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Chemical effects of heavy metals on the hydration of calcium sulphoaluminate 4CaO·3Al2O3·SO3

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Abstract

The system 4CaO·3Al2O3·SO3-CaSO4·2H2O-Ca(OH)2 was hydrated in the presence of ten dopants, specifically soluble salts of heavy metals.

When added in 10% amount, the effect of each salt is strongly evident at shorter curing times, the hydration kinetics being more favoured in the order Pb(NO3)2<K2CrO4< Cd(NO3)2< Zn(NO3)2t~Mn(NO3)3=K2MoO4<Ni(NO3)2<Cu(NO3)2<Cr(NO3)3<Fe(NO3)3. At longer curing times the differences among the systems decrease significantly.

The 28-day compressive strength is almost the same for all the systems except those containing Pb(NO3)2, K2MoO4 and K2CrO4.

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Authors and Affiliations

  1. Dipartimento di Chimica, Universitŕ di Napoli ‘Federico II’, via Mezzocannone 4, 80134, Napoli

    R. Berardi & L. Santoro

  2. Dipartimento di Ingegneria dei Materiali e della Produzione, Universitŕ di Napoli ‘Federico II’, Piazzale Tecchio 80, 80125, Napoli, Italy

    R. Cioffi

Authors
  1. R. Berardi
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  2. R. Cioffi
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  3. L. Santoro
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Berardi, R., Cioffi, R. & Santoro, L. Chemical effects of heavy metals on the hydration of calcium sulphoaluminate 4CaO·3Al2O3·SO3 . Journal of Thermal Analysis 50, 393–400 (1997). https://doi.org/10.1007/BF01980499

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  • DOI: https://doi.org/10.1007/BF01980499

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