Composite cement mortars based on marine sediments and oyster shell powder

H. Ez-zaki; A. Diouri; S. Kamali-Bernard; O. Sassi

doi:10.3989/mc.2016.01915

Autores/as

H. Ez-zaki Faculté des Sciences Université Mohammed V
A. Diouri Faculté des Sciences Université Mohammed V
S. Kamali-Bernard Institut National des Sciences Appliquées, Université Européenne de Bretagne
O. Sassi Ecole Normale Supérieure, Université Mohammed V

DOI:

https://doi.org/10.3989/mc.2016.01915

Palabras clave:

Caracterización, Hidratación, Calorimetría, Mortero, Durabilidad

Resumen

En este trabajo se ha valorado la sustitución de cemento en morteros por sedimentos marinos dragados y polvo de concha de ostra (OS). Los sedimentos tienen altos contenidos de agua, cloruros, calcita, cuarzo, illita y caolinita como minerales principales. Los polvos OS están compuestos de carbonato cálcico y trazas de otras impurezas. Se añadieron a un cemento Portland, cuatro mezclas de los sedimentos y polvos de OS tratados a 650 °C y 850 °C en proporciones del 8%, 16% y 33% en peso. La hidratación de pastas se estudió a través de calorimetría. Se estudió además la porosidad accesible al agua, densidad aparente, permeabilidad al gas, resistencia a compresión y carbonatación acelerada. En general, un aumento en la adición produjo una reducción del rendimiento de los morteros. Se observó, sin embargo, una reducción de la permeabilidad a los gases con porcentajes de adición de hasta el 33%. Con valores del 16% de sustitución, mejoraron las resistencias mecánicas y la resistencia frente a la carbonatación.

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