I—Investigations on a portion of the quaternary system CaO—-A1 2 O 3 -SiO 2 -Fe 2 -O 3 : The quaternary system CaO—2CaO . SiO 2 —

Abstract

The quaternary system investigated in the present work is of considerable interest from both scientific and technical points of view. In particular, the phase relationships in that part of the system having a high lime and low iron content are of fundamental importance in the study of Portland cement. It was with the object of elucidating these phase relationships in the study of Portland cement that this investigation was undertaken, but it was necessary to examine the system much beyond the limits of cement compositions. The results have perhaps a particular interest as representing the working out of a complete polythermal condensed quaternary system. Apart from certain limited studies on metals, we are not aware of any such complete system having previously been reported in the literature.