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A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications

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This Thesis is organised in eight chapters and the contents of the remaining ones are briefly described here.

 Chapter2 introduces the main issues related to the construction and demolition waste with a particular focus on the concrete waste generated by the demolition. 

Chapter3 reports a general overview of the actual guidelines and regulations dealing with to the use of recycled aggregate for concrete production.

 Chapter4 describes the main engineering properties of recycled concrete aggregates and then 

Chap.5 analyses the influence of using these aggregates in the resulting mechanical performance of structural concrete. Both chapters are organised by reviewing the corresponding State-of-the-Art and the experimental activities performed during this Ph.D. project..

Chapter 6 reports the results of a wide experimental campaign carried out on concretes made out with both Recycled Concrete Aggregates (RCA) and Fly-Ash (FA) by investigating the influence of water-to-binder ratio such us aggregate and cement replacement on the resulting concrete performance.

 Chapter 7 describes the proposed modelling approach for describing the chemical, physical and mechanical phenomena occurring when RCAs are employed for producing structural concrete. Particularly, it describes the analytical and numerical formulations used for analysing the time evolution of the relevant mechanical properties of concrete. 

The proposed experimental results and the theoretical models lead to a rational approach for controlling and predicting the compressive strength for RACs by taking into account both the processing procedure performed on RCAs, the relevant properties of constituents and the mixture composition: such formulations are summarised in Chap.8.

 Moreover, the last sections of Chap.8 report the main results achieved in the research, their impact on the current state of knowledge on structural concrete technology and the possible future developments of the present research.