Bibliography references generally indicate that workability reduction of CRA is higher, as long as the replacement rate of natural aggregates NA by recycled aggregates RA is also high. This is mainly because of the higher water absorption by RA, as proven in tests made by Santos 2002, Matías and Brito 2005 and Evangelista 2007 for a constant effective water/cement w/c ratio.
Las referencias bibliográficas relatan, en su generalidad, una disminución de la trabajabilidad del HAR tanto mayor cuanto mayor es la tasa de sustitución de áridos pétreos AP por AR, en parte debido a la mayor absorción de agua de los AR, como verificado en las campañas experimentales de Santos 2002, Matías e Brito 2005 e Evangelista 2007 para una relación agua/cemento a/c efectiva constante.