Vliv obsahu strusky v cementových záměsích na záchyt CO2

Abstract

This thesis investigates the effect of BOF steel slag content in cement mixtures on CO₂ capture by mineral carbonation. Binary mixtures of Portland cement CEM I 42.5 R with slag at replacement levels of 10–50 wt.% and two particle size fractions (< 0.1 mm and 0.1–0.5 mm) were prepared and subjected to both atmospheric carbonation and accelerated carbonation in an autoclave (0.5 MPa, 99.99 % CO₂, 24 h). CO₂ uptake was quantified by elemental analysis with blank correction and subtraction of the initial carbon content of the raw materials. The optimal binary mixture was identified as the blend containing 30 % slag at fraction < 0.1 mm, achieving a CO₂ uptake of 10.58 kg CO₂/t combined with a compressive strength of 37.69 MPa after 28 days of hydration. The presence of calcite as a carbonation product was confirmed exclusively in autoclave-carbonated samples by X-ray diffraction analysis. The results demonstrate a direct correlation between CO₂ uptake and the mechanical performance of the resulting composite.