Diabase-porphyrite crushing screenings as an alternative aluminosilicate component for Portland cement clinker production

This study evaluates the feasibility of using diabase–porphyrite crushing screenings from the Shekhjeli deposit, generated as a by-product of crushed-stone production, as an alternative aluminosilicate component in the raw meal for Portland cement clinker production. The raw materials were characterized by chemical and mineralogical analyses, and raw meal compositions were evaluated through calculation and laboratory firing. The phase composition and microstructure of the obtained clinker were examined by X-ray diffraction and SEM–EDS, while the technological and mechanical properties of the resulting cement were also determined. A three-component raw mix containing 20.73 wt.% diabase–porphyrite screenings was selected, and firing at 1420 °C resulted in the formation of the principal Portland cement clinker phases. SEM–EDS observations showed a relatively homogeneous clinker microstructure comparable to that of industrial clinker. Cement prepared from the experimental clinker exhibited normal hydration behaviour and reached a compressive strength of 39.5 MPa after 28 days of curing. These results demonstrate that diabase–porphyrite crushing screenings can serve as an alternative to the conventional clay component, contributing to the utilization of local mineral waste and expansion of the raw-material base for cement production.

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