4.7 Article

Dissolution and initial hydration behavior of tricalcium aluminate in low activity sulfate solutions

期刊

CEMENT AND CONCRETE RESEARCH
卷 130, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2020.105989

关键词

Kinetics; Ca3Al2O6; X-ray diffraction; Hydration; Dissolution

资金

  1. National Science Foundation [DMR-1332208]
  2. U.S. Department of Energy [DE-AC05-00OR22725]
  3. National Research Council (NRC) through an NRC Postdoctoral Research Associateship at the National Institute of Standards and Technology (NIST)

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Influences of alkali or alkaline earth sulfates on the hydration of cubic tricalcium aluminate (C(3)A) were evaluated by in situ dissolution rate measurements, by ex situ near-surface composition measurements with secondary ion mass spectrometry, and by in situ synchrotron X-ray diffraction to monitor precipitation of hydration products. Both slight reductions in dissolution rate and cation-specific interactions with the solid were observed. The near-surface Ca/Al ratio is significantly lower after some dissolution and the electrolyte cations are incorporated within the surface with different affinities (Mg2+ > K+ > Na+). An interfacial dissolution-reprecipitation mechanism may explain the observations as well as, or better than, a simple cation exchange. The sulfate concentration in solution affects the rates of both C(3)A dissolution and precipitation of hydration products. Sulfate ions likely adsorb at the hydrous Al-rich surface layer, thereby reducing the dissolution rate of aluminates and delaying the precipitation of aluminate hydration products.

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