Solid solution of ettringites: Part II: Incorporation of B(OH)4− and CrO42− in 3CaO·Al2O3·3CaSO4·32H2O

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Abstract

Solid solutions of ettringites containing SO42−, B(OH)4− and CrO42− were investigated. The compositions of the solid solutions under different synthesis conditions are represented by paste reaction (1) and “saccharate method” (2):

  • 1.

    1: [Ca6Al2 (OH)12·24H2O]6+ [(3−3x) (SO4)·(3x) (Cro4)·2H2O]6− 0≤x≤1

  • 2.

    2: [Ca6Al2 (OH)12·24H2O]6+ [(x) (SO4)·(3−x) (Cro4)·2H2O]6− 0≤x≤1

  • 3.

    3: [Ca6Al2 (OH)12·24H2O]6+. [(3−3x) (SO4)·(2x) (OH)·(4x)B (OH)4·yH2O]6− 0≤x≤1

  • 4.

    4: [Ca6Al2 (OH)12·24H2O]6+. [(3−3x) (SO4)·(4x) (OH)·(2x)B (OH)4·yH2O]6− 0≤x≤1

The crystallographic properties of the different solid solution series were determined. An interpretation of the ternary solid solutions is given.

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