4.7 Article

Early hydration of C3A-gypsum pastes with Ca- and Na-lignosulfonate

Journal

CEMENT AND CONCRETE RESEARCH
Volume 79, Issue -, Pages 333-343

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2015.10.008

Keywords

Admixture (D); Ca3Al2O6 (D); Ettringite (D); Hydration (A); X-ray diffraction (B)

Funding

  1. Norwegian Research Council [NFR 225358/030]
  2. Borregaard

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The early age phase development during the hydration of C(3)A-gypsum pastes with 1 and 4% Ca- or Nalignosulfonate (CLS and NLS) was investigated using isothermal calorimetry, in-situ XRD, thermogravimetry, mass spectroscopy, and SEM analysis. With 1% CLS or NLS neither retardation of C(3)A dissolution nor retardation of ettringite formation was observed. When LS was added in a concentration of 4%, C(3)A and gypsum dissolution were slightly retarded. Gypsum depletion was delayed in all pastes containing CLS or NLS. 1% CLS or NLS increased the amount of AFm-phases formed within 24 h, while the amount of AFm was reduced with 4% CLS or NLS. The initial heat flow increased and the heat flow in the gypsum depletion peak was reduced with 1 and 4% CLS. With 4% NLS no initial heat flow was measured and the heat developed slowly within the first 15 min of hydration in the C(3)A-gypsum paste. (C) 2015 Elsevier Ltd. All rights reserved.

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