Influence of whitening additives on the properties of decorative slag-alkali cements and mortars
| Autor: | P. Krivenko, F. Puertas, V. Gots, O. Helevera, N. Rogozina |
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| Jazyk: | English<br />Spanish; Castilian |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Materiales de Construccion, Vol 73, Iss 350 (2023) |
| Druh dokumentu: | article |
| ISSN: | 0465-2746 1988-3226 |
| DOI: | 10.3989/mc.2023.319622 |
| Popis: | The paper shows a comparative study of the influence of whitening additives (kaolin, TiO2 and СаСО3) on the production of decorative alkali-activated slag cement and mortars with a degree of whiteness of at least 70%; as well as their influence on the structure formation and evolution of physico-mechanical properties. According to results obtained, kaolin provides chemical bonding of Na+ into insoluble zeolite-like compounds; and CaCO3 densifies the structure and reduces shrinkage deformations. At the early stages of hardening (up to 7 days), the additions of kaolin and calcite, due to their significant amount (15 and 24%), reduces the compressive strength of the cement paste; nevertheless, at later ages (until 90 days) the difference in strength almost disappears. The high colourfastness and weather resistance of pigmented cements under the influence of ultraviolet radiation and freeze/thaw cycles has been established. A comparative assessment of the economic efficiency has shown that СаСО3 is the best cost-effective additive. |
| Databáze: | Directory of Open Access Journals |
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