Influence of whitening additives on the properties of decorative slag-alkali cements and mortars
The paper shows a comparative study of the influence of whitening additives (kaolin, TiO2 and CaCo3) 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-mec...
| Autores: | , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/356009 |
| Acesso em linha: | http://hdl.handle.net/10261/356009 |
| Access Level: | acceso abierto |
| Palavra-chave: | Alkali-activated slag cements Colour stability Pigments Decorative cements Freeze/thaw resistance Behaviour. |
| Resumo: | The paper shows a comparative study of the influence of whitening additives (kaolin, TiO2 and CaCo3) 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 CaCo3 is the best cost-effective additive. |
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