Evaluación de la adición mineral activa de base arcilla calcinada-caliza (LC2) producida a nivel de laboratorio
Fecha
2018-06
Autores
Pérez Marín, Mariam
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Editor
Universidad Central “Marta Abreu” de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil.
Resumen
Con el propósito de sustituir gran porcentaje de cemento en las mezclas de hormigones y morteros, se ha venido realizando el estudio de una nueva adición mineral activa de base arcilla calcinada-caliza (LC2). El presente trabajo evaluó las propiedades de esta nueva adición a escala de laboratorio con una proporción de 70% de P-35 y 30% de LC2, a fin de comprobar la efectividad de la producción a niveles industriales. Para esto se llevaron a cabo ensayos como Finura de molido. Los resultados de este ensayo muestran que la finura alcanzada no cumple con lo establecido en la norma, sin embargo, no influyeron negativamente en las prestaciones de cemento estudiadas, por lo que se tiene en cuenta como un aspecto positivo de la adición. En el ensayo de Calorimetría Isotérmica la curva calorimétrica muestra una adecuada sulfatación del sistema. Los cementos mezclados con un 30% de adición de LC2 no solo cumplen con la NC 95:2011 en cuanto a resistencia a compresión para las tres edades muestreadas, sino que la supera en un 42%, 22.7% y 7.55% respectivamente, lo mismo ocurre con respecto al cemento P-35, lo supera a los 3, 7 y 28 días en un 37%, 7% y 8.4% respectivamente, lo que demuestra el buen comportamiento de estos, validando su uso en la construcción
With the purpose of replacing a high percentage of cement in concrete and mortar mixtures, a new active mineral addition of calcined clay-limestone base (LC2) has been studied. The present work evaluated the properties of this new addition at laboratory scale with a proportion of 70% of P-35 and 30% of LC2, in order to verify the effectiveness of production at industrial levels. For this, tests were carried out such as Grinding finesse. The results of this test show that the fineness achieved does not comply with the provisions of the standard, however, they did not negatively influence the performance of the cement studied, so it is taken into account as a positive aspect of the addition. In the Isothermal Calorimetry test the calorimetric curve shows an adequate sulfation of the system. Cements mixed with a 30% addition of LC2 not only comply with the NC 95: 2011 in terms of compressive strength for the three ages sampled, but it exceeds it by 42%, 22.7% and 7.55% respectively, the same occurs with respect to cement P-35, it exceeds 3, 7 and 28 days by 37%, 7% and 8.4% respectively, which demonstrates the good behavior of these, validating their use in construction.
With the purpose of replacing a high percentage of cement in concrete and mortar mixtures, a new active mineral addition of calcined clay-limestone base (LC2) has been studied. The present work evaluated the properties of this new addition at laboratory scale with a proportion of 70% of P-35 and 30% of LC2, in order to verify the effectiveness of production at industrial levels. For this, tests were carried out such as Grinding finesse. The results of this test show that the fineness achieved does not comply with the provisions of the standard, however, they did not negatively influence the performance of the cement studied, so it is taken into account as a positive aspect of the addition. In the Isothermal Calorimetry test the calorimetric curve shows an adequate sulfation of the system. Cements mixed with a 30% addition of LC2 not only comply with the NC 95: 2011 in terms of compressive strength for the three ages sampled, but it exceeds it by 42%, 22.7% and 7.55% respectively, the same occurs with respect to cement P-35, it exceeds 3, 7 and 28 days by 37%, 7% and 8.4% respectively, which demonstrates the good behavior of these, validating their use in construction.
Descripción
Palabras clave
Reducción del factor clínquer, Materiales cementicios suplementarios, Adiciones minerales puzolánicas, Reduction of the clínker factor, Supplementary cement materials, Pozzolanic mineral additions.