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High-frequency fatigue testing of recycled aggregate concrete

Abstract: Concrete fatigue behaviour has not been extensively studied, in part because of the difficulty and cost. Some concrete elements subjected to this type of load include the railway superstructure of sleepers or slab track, bridges for both road and rail traffic and the foundations of wind turbine towers or offshore structures. In order to address fatigue problems, a methodology was proposed that reduces the lengthy testing time and high cost by increasing the test frequency up to the resonance frequency of the set formed by the specimen and the test machine. After comparing this test method with conventional frequency tests, it was found that tests performed at a high frequency (90 ± 5 Hz) were more conservative than those performed at a moderate frequency (10 Hz); this effect was magnified in those concretes with recycled aggregates coming from crushed concrete (RC-S). In addition, it was found that the resonance frequency of the specimen?test machine set was a parameter capable of identifying whether the specimen was close to failure.

 Fuente: Applied Sciences 2020, 10(1), 10

 Editorial: MDPI

 Fecha de publicación: 01/01/2020

 Nº de páginas: 16

 Tipo de publicación: Artículo de Revista

 DOI: 10.3390/app10010010

 ISSN: 2076-3417

 Proyecto español: MAT2014-57544-R