The influence of carbon and basalt fibres addition on hydraulic lime mortars mechanical properties and durability has been studied. The objective is to evaluate the possible use in restoration of architectural heritage, as an alternative to Portland cement because of the pathological processes that the latter causes. To assess the effect, the obtained results have been compared with two reference mortars: hydraulic lime with no additions and basalt fibres. The amount of fibres to be incorporated is questioned in the first phase. The tests performed show that the incorporation of 1% of fibres (volume) in the mortars, improves their behaviour under bending and compression loads. Additionally, the fibres increase the ductility of the reinforced mortar, almost doubling the effect that causes the addition of basalt fibres. Finally, the durability studies show the increase in ductility caused by the addition of carbon fibres, despite the logic decrease experienced after the ageing tests. Keywords: Hydraulic lime, mortar, carbon fibre, basalt fibre, ductility, durability
Del conjunto de normativa técnica de los sistemas que forman un edificio se desprende una serie de actividades programadas periódicamente, que forman el Plan de Mantenimiento Preventivo Legal del Edificio. Este Plan contempla la intervención en los sistemas en los que los fallos pueden provocar daños importantes para la salud de los usuarios (ascensores, calderas, etc.) o lesiones de elevado impacto económico (fachadas, cubiertas, etc.). Lo cierto es que las buenas prácticas de mantenimiento implantadas en edificios de otros usos (industrial, hospitalario, de pública concurrencia, etc.) no se trasladan a la edificación residencial, a pesar de conformar el mayor grupo de todos. De lo anterior se desprenden varias circunstancias negativas: el mantenimiento diferido se transforma en correctivo, con los elevados costes económicos que conlleva por los valores agregados de urgencia y oportunidad; los sistemas y materiales disminuyen su ciclo de vida, precipitando su renovación; la responsabilidad de los propietarios frente a daños a terceros aumenta, y no siempre la póliza de seguro contratada contempla la cobertura de todas las situaciones en las que hay un manifiesta dejación de funciones. El papel del Graduado en Edificación debe ser fundamental en todos los procesos relacionados con el mantenimiento de los edificios. Por su formación conoce las características de los materiales y sistemas constructivos, así como los criterios de durabilidad y los mecanismos a través de los cuales se inician los procesos patológicos. Es capaz, por tanto, de interpretar las lesiones y daños que aparecen y de planificar las acciones correctoras necesarias. Buscando un símil con el campo de la medicina: los edificios necesitan un médico de cabecera que reconozca el estado de los mismos en una primera instancia y que sepa diagnosticar y curar llegado el caso, o bien, desviar el mismo hacia algún especialista que lo trate. Ese "técnico de cabecera" es el graduado en edificación. Esta comunicación trata de la importancia del sector para las empresas y los técnicos, de su tamaño, sus prácticas y de su desarrollo y expectativas. with other uses (industrial, hospital, public, etc.) are not transferred to residential buildings, despite forming the largest group of all of them. Several negative circumstances arise from the above considerations: deferred maintenance becomes corrective one with the high economic costs associated with the added values of urgency and opportunity, systems and materials life cycle reduction trigger the renewal; the owner's liability to third parties' damages increases and the insurance policy contracted not always covers all situations where exist a clear lack of functions. The role of the Building Engineering graduate must be fundamental in all the processes related to the building maintenance. The university education offers the knowledge in the characteristics of the materials and constructive systems, as well as the criteria of durability and the mechanisms through which pathological processes initiate. Therefor...
The influence of the specimen's geometry on the mechanical properties of cement mortars with addition of carbon and basalt fibers has been studied. The first phase focused on the influence of the different amount of fibers on the mechanical properties of mortars. The tests showed that the addition of a 1% of fibers on the mortars significantly improved their energy absorption capacity. In the second phase, eight different specimen geometries were tested: four by flexural tests and four by compressive tests. The analysis of the results showed the influence of the specimen's geometry on the mechanical characteristics of mortars with fibers, in particular, in their post-break behavior. In addition, the mortars with carbon fibers showed a higher energy absorption capacity than the mortars with basalt fibers, regardless of the type of specimen tested.
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