Abstract
In this investigation a study has been made of methods for preparing compounds of CaO with Al 2 O 3 and SiO 3 which may occur in Portland cements. The products from the different methods were studied microscopically and by the X‐ray diffraction method, and the X‐ray diffraction patterns for γ and β 2CaO·SiO 2 and 3CaO·SiO 2 are given.

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