The compositions of phases of five commercial Portland cement clinkers were studied using a Camebax apparatus of the type MB-1. To make a quantitative calculation of the elements, the following standards were synthesized: solid solutions of C3S with Na2O, K2O, MgO, Al2O3, Fe2O3; C3S with MnO; C3S with TiO2; C2S with P2O5; C3A with Na2O; C4AF with MgO; C6A2F with Na2O, MgO, MnO, SiO2, TiO2; a glass containing SO3. Electron microprobe data on the composition of cement minerals (clinker phases) permit some general conclusions. Each of the impurities of raw material can be present in any cement mineral. The composition of crystals of one and the same clinker phase is different due to non-equilibrium conditions of their formation. The aluminate phase deserves special attention. The greatest amount of impurities is distributed in its structure.
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