
handle: 10045/35116
En este trabajo se ha estudiado la evolución de la microestructura, propiedades de durabilidad y resistencias mecánicas de morteros preparados con cementos comerciales, que contienen ceniza volante (entre un 21% y un 35%) y escoria de alto horno (entre un 66% y un 80%), expuestos a tres ambientes, un ambiente óptimo de laboratorio, y dos ambientes representativos del clima Atlántico y Mediterráneo respectivamente. Como referencia de comportamiento, también se ensayaron morteros de cemento Portland. La microestructura se caracterizó mediante porosimetría de intrusión de mercurio. En lo referente a la durabilidad, se estudiaron los coeficientes de absorción capilar y de migración de cloruros en estado no estacionario. También se determinó la resistencia a compresión de los morteros. Los ensayos se realizaron a 7, 28 y 90 días. La principal conclusión alcanzada es que los cementos con cenizas y escorias expuestos a condiciones ambientales representativas de los climas Atlántico y Mediterráneo, pueden desarrollar unas propiedades en servicio adecuadas al cabo de tres meses.
In this work, the evolution of the microstructure, durability properties and mechanical strength of mortars made with commercial cements, which contain fly ash (between 21% and 35%) and ground granulated blast-furnace slag (between 66% and 80%), were studied. These mortars were exposed to three different environments during their hardening, an optimum laboratory condition, and two environments representing a mild Atlantic climate and a Mediterranean climate, respectively. As a reference, ordinary Portland cement mortars were also tested. The microstructure was characterized using mercury intrusion porosimetry. Regarding durability, the capillary suction coefficient and non-steady-state chloride migration coefficient were determined. Compressive strength was studied too. The tests were performed at 7, 28 and 90 days. The main conclusion of this work is that cements with slag and fly ash hardened under environmental conditions of Atlantic and Mediterranean climates, can develop good service properties after three months of hardening.
Este trabajo ha sido financiado por el Ministerio de Ciencia e Innovación y Economía y Competitividad del Gobierno de España a través de los proyectos BIA2010-20548 y BIA2011-25721. J.M. Ortega ha sido beneficiario de una beca predoctoral perteneciente al programa de “Formación de Personal Investigador (FPI)” (referencia BES-2008-002650).
Ceniza volante, Ground granulated blast-furnace slag, Escoria de alto horno, Fly ash, Ambiente de endurecimiento, Microestructura, Hardening environment, Ingeniería de la Construcción, Microstructure, Durabilidad, Durability
Ceniza volante, Ground granulated blast-furnace slag, Escoria de alto horno, Fly ash, Ambiente de endurecimiento, Microestructura, Hardening environment, Ingeniería de la Construcción, Microstructure, Durabilidad, Durability
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