A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications

verfasst von: Marco Pepe

Verlag: Springer International Publishing

Buchreihe : Springer Theses

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

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Über dieses Buch

This book reports on the physical and mechanical characterization of Recycled Aggregate Concrete (RAC), produced through a partial-to-total replacement of ordinary aggregates with what have been dubbed Recycled Concrete Aggregates (RCAs). It proposes a theoretical framework for understanding the relationships between RCAs and RCA, and for predicting the resulting behavior of RAC. The book demonstrates that in the case of RAC two additional parameters have to be taken into account than with ordinary aggregates, due to the composite nature and higher porosity of RCAs. By extending Abrams’ Law for Recycled Aggregate Concrete, it represents a first step in the formulation of a general model for predicting the properties of RAC. The theoretical approach presented here addresses an important gap in the literature and is expected to stimulate new research on the use of this more sustainable form of concrete in structural applications.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

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). Particularly, this chapter summarises the motivation of the research, the main contribution of this study and the thesis outline.

Marco Pepe

Chapter 2. Concrete Industry: Waste Generation and Environmental Concerns

Abstract

In the second half of the last century, the world production of goods and services increased disproportionately, due to a strong demographic growth, expansion of urban areas and a great development of industrialization. Apart from undoubted benefits in terms of improved living standards, this phenomenon also resulted in an growing pressure on natural balances and resources of the Earth. However, the above mentioned process led to a remarkable increase in waste generation. This chapter introduces the main issues related to the construction and demolition waste with a particular focus on the concrete waste generated by the demolition.

Marco Pepe

Chapter 3. Regulatory Environment and Guidelines for RACs

Abstract

This chapter outlines existing standards, regulations and guidelines addressing the use of RCAs for the production of structural concrete. Particularly, the attention is focused on the Italian relevant code provisions, but also other regulations are considered. The most remarkable cases concern countries in which waste disposal represents a crucial problem due to morphological and environmental conditions, such as Hong Kong and North European countries, or industrial countries that have promoted a new urbanisation process (e.g. Germany during the last few decades). However, also the United States and Australia are mentioned as they show a growing interest about sustainable concrete waste reusing.

Marco Pepe

Chapter 4. Recycled Concrete Aggregates

Abstract

This chapter describes the main features of Recycled Concrete Aggregates (RCAs). An overview of the previous works available in literature is firstly presented. Then, the experimental activities performed on RCAs for the present research are described and discussed. The analysis of the experimental results available for RCA particles led to proposing some analytical formulations intended at correlating the main engineering properties of RCAs.

Marco Pepe

Chapter 5. Recycled Aggregate Concretes

Abstract

This chapter aims at reporting the main information about the mechanical properties of concrete made with recycled concrete aggregates. The first section proposes an overview about concrete technology and summarises well known rules and practices currently adopted in the field of concrete technology. The second section proposes a summary of the State-of-the-Art knowledge about RAC. Finally, all the applied research methodology and the performed experimental activities are described.

Marco Pepe

Chapter 6. Insights into the Influence of Cement Replacement in Recycled Aggregate Concrete

Abstract

This chapter addresses the mechanical behaviour of concrete made with both recycled concrete aggregates and fly ash. A brief overview on the influence of fly ash in concrete mixtures are outlined. Then, the results of a wide experimental campaign carried out on concrete samples made with both recycled concrete aggregates (RCAs) and fly-ash (FA), respectively in partial substitution of natural aggregates and cement, are proposed.

Marco Pepe

Chapter 7. Predicting the Mechanical Properties of RAC

Abstract

This chapter describes some of the possible modelling approaches for both predicting and controlling the key mechanical properties of Recycled Aggregate Concretes. The chapter is organised in three sections in which the different models applied during the research are described. Particularly, in the last section an innovative modelling methodology is proposed for the case of RAC. The proposed formulations should be considered as a novel conceptual approach capable of considering the key physical and mechanical features characterising the structural behaviour of resulting concrete made out with Recycled Concrete Aggregates.

Marco Pepe

Chapter 8. Mix Design Formulation for RAC

Abstract

This chapter summarises the results obtained in this thesis and proposes a comprehensive physically-based conceptual approach for designing RAC mixtures for a given target compressive strength.

Marco Pepe

Titel: A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications
verfasst von: Marco Pepe
Verlag: Springer International Publishing
Electronic ISBN: 978-3-319-26473-8
Print ISBN: 978-3-319-26472-1
DOI: https://doi.org/10.1007/978-3-319-26473-8