Hydrothermally Treated Cement Bypass Dust as a Supplementary Cementitious Material

Rimvydas Kaminskas (), Brigita Savickaite and Anatolijus Eisinas
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Rimvydas Kaminskas: Department of Silicate Technology, Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu 19, LT-50254 Kaunas, Lithuania
Brigita Savickaite: Department of Silicate Technology, Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu 19, LT-50254 Kaunas, Lithuania
Anatolijus Eisinas: Department of Silicate Technology, Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu 19, LT-50254 Kaunas, Lithuania

Sustainability, 2025, vol. 17, issue 15, 1-16

Abstract: In this study, the possibility of using cement bypass dust as a cement additive was investigated. The utilization of cement bypass dust remains a major problem in cement production, as huge amounts of it are stored in landfills. In this study, a hydrothermal treatment is proposed to modify the properties of this dust and to expand its use. Hydrothermal treatment with pure bypass dust and quartz was carried out to achieve a CaO/SiO 2 ratio of 1 to 2. Samples were synthesized at 200 °C for 2, 4, 8, and 24 h. To examine the influence of the hydrothermal treatment on cement properties, a sample with a CaO/SiO 2 ratio of 1, hydrothermally treated for 8 h, was selected. This study employed XRD, XRF, DSC-TG, and isothermal calorimetry. Most of the target synthesis products, e.g., tobermorite and calcium silicate hydrates, formed after 8 h of sample synthesis, during which quartz was added to bypass dust and a CaO/SiO 2 ratio of 1 was achieved. An examination of the composition of the liquid medium following hydrothermal processing showed that almost all chlorine passed into the liquid medium, while some K 2 O remained in the solid synthesis product. The synthesized additive is an effective catalyst for the hydration of Portland cement. After a 28-day curing period, specimens incorporating modified bypass dust replacing up to 10% of the Portland cement by weight demonstrated compressive strengths comparable to, or surpassing, those of specimens composed exclusively of Portland cement.

Keywords: cement bypass dust; hydrothermal treatment; Portland cement; hydration (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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