Szczegóły publikacji
Opis bibliograficzny
Determination of calcined clay minerals impact on strength and carbonation of Portland cement mortars using k-value concept / J. SZYDŁOWSKI, Ł. KOTWICA // W: ICCC 2023 [Dokument elektroniczny] : further reduction of CO2 - emissions and circularity in the cement and concrete industry : 16th International Congress on the Chemistry of Cement 2023 : September 18–22, 2023, Bangkok, [Thailand] : congress proceeding, Vol. 4. — Wersja do Windows. — Dane tekstowe. — [Bangkok] : Thailand Concrete Association, [2023]. — S. 169–172. — Wymagania systemowe: Adobe Reader. — Tryb dostępu: https://www.iccc-online.org/fileadmin/gruppen/iccc/proceeding... [2023-12-29]. — Bibliogr. s. 172, Abstr.
Autorzy (2)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 151112 |
|---|---|
| Data dodania do BaDAP | 2024-01-12 |
| Rok publikacji | 2023 |
| Typ publikacji | materiały konferencyjne (aut.) |
| Otwarty dostęp |  |
| Creative Commons |
Abstract
The paper focuses on replacing Portland clinker with thermally activated clay minerals. The thermal activation temperature depends on the particular mineral but, in general, it is much lower compared to the temperature used for the production of Portland clinker. The incorporation of calcined clays as SCMs significantly reduces the energy required for cement production, as well as the carbon footprint. The clay minerals used in the present study: montmorillonite and kaolinite differ in their nature and therefore in their properties during and after calcination. Quantitative determination of the influence of investigated calcined clay minerals on the hydration and strength of cement-based composites was made. The concept of k-value based on the EN 206-1 standard was used for a qualitative comparison of the influence of calcined kaolinite and montmorillonite on mortar strength. After 28 days of hydration, the k-values of calcined kaolinite and montmorillonite were 2.8 and 1.1 respectively, indicating their superior activity. On the other hand, both SCMs reduce the resistance to carbonation as a result of a reduction in the calcium oxide content. The tests were performed not only for different carbonation periods but also after different hydration times. In general, one can conclude that both calcined clays worsen carbonation resistance, and their influence is similar to the influence of ground quartz sand, used as a neutral filler. The results indicate an improved corrosion resistance for longer maturation times. It may be of importance in the attempt to construct a carbonation model and ultimately lead to a longer estimated lifetime of the structure.
