Performance of silicic pozzolans and Portland cements in their behavior in front of gypsum attack as determined by ASTM C 452-68
[EN] For this study, ASTM C 452-68 testing was conducted for two years on 54 POZC-silica fume (SF) or diatomites (D and N) (=Z pozzolans), were tested for 2 years, by ASTM C 452-68 method, having determined to their specimens their Vcl(=ΔL(%)/day) . The results have borne out that the pozzolanic rea...
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/79604 |
| Acceso en línea: | http://hdl.handle.net/10261/79604 |
| Access Level: | acceso abierto |
| Palabra clave: | Gypsum attack Portland cements Silica fume Diatomites Ataque del yeso Cementos Pórtland Humo de sílice Diatomeas |
| Sumario: | [EN] For this study, ASTM C 452-68 testing was conducted for two years on 54 POZC-silica fume (SF) or diatomites (D and N) (=Z pozzolans), were tested for 2 years, by ASTM C 452-68 method, having determined to their specimens their Vcl(=ΔL(%)/day) . The results have borne out that the pozzolanic reactions from SiO2 r- of these Z pozzolans, in a sulfatic environment, had prevailed sooner (with D and N) or later (with SF) over the sulfatic hydration of their POZC, reaching completion in the first 28 days. Therefore, after positive result is obtained in the Frattini test, as well as in other equivalent tests standardized, the ASTM C 452- 68 test can be validly used to differentiate 28-day POZC-Z pozzolan or with any other from natural or artificial origin, which may or may not give rise to the development of low, moderate or high SR. The only requisite would be to establish suitable standard physical-chemical requirements and specifications.. |
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