Mechanical and dynamical stability of major oxide constituents of Portland cement clinker: a density functional theory study

Abstract

Quantum‐mechanical calculations based on the density functional theory (DFT) enable an effective characterization of a variety of properties of materials at the atomistic level, although at a high computational cost. Here, we fully exploit parallel computing to apply such methods to the study of lattice dynamics and mechanical response of the major oxide constituents of Portland cement clinker: , , , and . Raman spectra and the evolution of the elastic tensor (and associated mechanical properties) with pressure are predicted for all oxide systems. We devote much attention to the assessment of dynamical and mechanical stability of the many previously proposed polymorphic forms of the most abundant oxide: . Specifically, five different crystalline models of are analyzed: only two turn out to be dynamically stable. The mechanical response of is further analyzed as a function of temperature through a quasi‐harmonic description of its lattice dynamics.

Experimental Study on Calcination of Portland Cement Clinker Using Different Contents of Stainless Steel Slag

“…The demand for silicate cement is increasing globally [19], yet the production of silicate cement clinker [20,21] remains a high-energy, high-pollution industry that consumes significant mineral resources and energy [22,23]. The decomposition of limestone and the combustion of fuels during clinker production emit large amounts of CO 2 , making the efficient and clean production of silicate cement an urgent issue to address [24][25][26].…”