Influence of whitening additives on the properties of decorative slag-alkali cements and mortars
Author(s): |
P. Krivenko
F. Puertas V. Gots O. Helevera N. Rogozina |
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Medium: | journal article |
Language(s): | Spanish |
Published in: | Materiales de Construccion, April 2023, n. 350, v. 73 |
Page(s): | e311 |
DOI: | 10.3989/mc.2023.319622 |
Abstract: |
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. |
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data sheet - Reference-ID
10725329 - Published on:
30/05/2023 - Last updated on:
30/05/2023