THE EFFECT OF MECHANICAL ACTIVATION OF MIXED PORTLAND CEMENT IN THE PRESENCE OF A SUPERPLASTICIZER ON THE COMPRESSIVE STRENGTH OF CEMENT STONE
DOI:
https://doi.org/10.31650/2786-6696-2025-14-96-102Keywords:
mechanic activation, Portland cement, superplasticizer, mineral additive, compressive strength, variable factors.Abstract
The presented article provides experimental results related to determining the influence of mechanic activation of mixed Portland cement and a superplasticizing admixture on the physical and mechanical properties of cement stone under compression at the ages of 3, 7, and 28 days. Such cement was obtained by mixing Portland cement PC-I 500 with ground quartz sand, the amount of which varied within the range of 30–60 % of the total binder mass. A promising method for increasing the compressive strength of cement stone is intensive mechanic and chemical activation of mixed cement in a high-speed turbulent-type activator in the presence of a superplasticizer SP-5, the content of which varied from 0 to 1 % of the binder mass.
The research was carried out using D-optimal mathematical experimental design, with variation of the following factors: consumption of ground quartz sand (45 ± 15) % of the mixed binder mass and the amount of superplasticizing admixture (% of the mixed binder mass). The cement-water mixture was prepared using two technologies: the first with a high-speed activator (rotor speed 1500 rpm) and the second by traditional (control) mixing. The obtained mathematical models indicate a significant influence on the compressive strength of the cement stone by both the formulation factors (X₁, X₂) and the technological parameters of the mixing process. It should be noted that the combined effect of mechanic and chemical activation, the amount of ground sand, and the superplasticizer makes it possible to increase the compressive strength of the cement stone (compared to the control) by 22…41 %, which allows a substantial increase in the proportion of ground quartz sand in the mixed binder composition as a mineral additive to cement.
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