| dc.description.abstract | This thesis proposes a conceptual formulation for controlling the resulting mechanical
properties of Recycled Aggregate Concretes (RACs) via generalised mix-design rules intended at
covering the specific features of Recycled Concrete Aggregates (RCAs).
As a matter of fact, the RCAs are characterised by a higher porosity and water absorption
capacity than ordinary aggregates and, hence, general mix-design rules for ordinary structural
concrete cannot be applied to RACs as such. Therefore, as a further step that goes beyond the
currently available experimental and empirical investigations, the research presented in the present
thesis proposes a rational mix design method for predicting the compressive strength evolution of
RACs by considering both the mixture composition and the key properties of RCAs (i.e.; the
amount of the attached mortar and indirectly the water absorption capacity). The formulations
proposed in this thesis are based upon the results of several investigations carried out for
characterising both RCAs and RACs. In fact, several tests were performed on different kinds of
recycled aggregates, taking into account their origin, the processing procedure adopted for crushing
the concrete demolition debris and their resulting size grading. The analysis of the results obtained
in these tests led to proposing a comprehensive conceptual formulation that links the main
engineering properties of aggregates to the porosity, particle density and attached mortar content of
RCAs. Moreover, several concrete batches were produced for investigating the influence that three
key parameters (viz. aggregate replacement ratio, nominal water-to-cement ratio and initial
moisture condition of aggregates) have on the relevant properties for structural concrete. The
behaviour of structural concrete is then analysed at a “fundamental” level, with the aim of
scrutinising the physical properties and the mechanical behaviour of RACs, by taking into account
the actual mixtures composition. Particularly, it is based on observing the hydration process
developing inside RACs during the setting and hardening phase, and how these are influenced by
the presence of RCAs.
The activities described in this work were carried out at the laboratories of the University of
Salerno (IT), the Federal University of Rio de Janeiro (BR), as part of the “EnCoRe” Project (FP7-
PEOPLE-2011-IRSES n. 295283; www.encorefp7.unisa.it) funded by the European Union within
the Seventh Framework Programme, and Delft University of Technology (NL). [edited by Author] | it_IT |
