Anchorage of steel rebars to recycled aggregates concrete

As main conclusions of this research study, it can be stated that NCA by RCCA replacement ratio has a negative impact on the mechanical properties of concrete, presenting an approximately linear correlation. Only for lower replacement ratios, namely 20%, there are not any clear changes in concrete mechanical properties, and a slight increase can even occur. Regarding the anchorage strength of ribbed steel rebars to concrete, the incorporation of RCCA has a similar effect: the increase of the NCA by RCCA replacement ratio leads to a decrease of this parameter. This effect can be well explained analysing the stress distribution inside the pull-out specimens using a finite-element model developed with this aim, also presented herein.