A study of the effects of nickel chloride and calcium chloride on hydration of portland cement

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Portland cement samples containing amounts of CaCl and NiCl ranging from approximately 1% to 20% by weight have been examined by Si and Al solid-state MAS NMR as a function of time, and some of the mature pastes have been characterized by X-ray diffraction. Changes in physical properties that had been previously observed as a function of amounts of salt added are clearly traceable to differences in the silicate matrices. Low concentrations of both salts promote Q formation, but high concentrations result in formation of much more Q at the expense of Q . Both salts accelerate both aluminate and silicate hydration, and the effects appear to be almost entirely due to chloride. Minor variations in hydration rates at high Ni concentrations may be the result of nickel salt precipitation. © 1993. 2 2 29 27 1 2 1

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Cement and Concrete Research

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