МОДИФИКАЦИЯЛАУШЫ ҚОСПАЛАРЫ БАР ФОСФОРЛЫ ШЛАК НЕГІЗІНДЕГІ ҰСАҚ ҰНТАҚТАЛҒАН ЦЕМЕНТТІҢ ФИЗИКА-МЕХАНИКАЛЫҚ ҚАСИЕТТЕРІ

Abstract

The article presents the results of a study on the physicomechanical properties of finely ground cement based on electrothermophosphorus slag modified with functional additives. The effects of mechanical activation on the specific surface area of the cement, hydration processes, microstructure of the cement stone, and strength characteristics were investigated. X-ray diffraction analysis, scanning electron microscopy, differential thermal analysis, and mechanical testing were employed. An increase in the degree of mechanical activation was found to enhance the hydraulic activity of phosphorus slag and accelerate structure formation. As the specific surface area of the cement increased from 320 to 610 m²/kg, the 28-day compressive strength increased from 38.4 to 66.5 MPa, while porosity decreased from 21.8% to 12.9%. The use of polycarboxylate-based superplasticizers reduced the water-to-cement ratio and promoted additional densification of the cement structure. The incorporation of phosphorus slag was shown to reduce clinker consumption and CO₂ emissions while improving the service performance of concrete.