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Über dieses Buch

This book presents the work done by the RILEM Technical Committee 227-HPB (Physical properties and behaviour of High-Performance Concrete at high temperature). It contains the latest research results on the behaviour of high-performance concretes at high temperature.

The book presents the state of the art of experimental data on High-Performance concretes and it collects and synthesizes useful data about concrete behaviour at high temperatures. The book is divided into independent chapters dealing with degradation reactions in concrete exposed to high temperatures; mass transport properties; thermal properties; and mechanical properties.

The results presented especially target a group of users composed by universities and testing laboratories, building material companies and industries, material scientists and experts, building and infrastructure authorities, designers and civil engineers.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract
This book presents the work done by the RILEM Technical Committee 227-HPB (Physical properties and behaviour of High-Performance Concrete at high temperature). It contains the latest research results on the behaviour of high-performance concretes at high temperature. The book presents the state of the art of experimental data on High-Performance concretes and it collects and synthesizes useful data about concrete behaviour at high temperatures. The book is divided in independent chapters dealing with:
  • Degradation reactions in concrete exposed to high temperatures
  • Mass transport properties
  • Thermal properties
  • Mechanical properties
The results presented especially target a group of users composed by universities and testing laboratories, building material companies and industries, material scientists and experts, building and infrastructure authorities, designers and civil engineers.
Pierre Pimienta, Robert Jansson McNamee, Jean-Christophe Mindeguia

Chapter 2. Degradation Reactions in Concretes Exposed to High Temperatures

Abstract
The aim of this chapter is to present the relevant degradation processes occurring at the micro-level in concrete exposed to high temperatures, with special interest to the differences associated with High Performance Concrete (HPC) and Self Compacted Concretes (SCC) in respect to Ordinary Concrete. The microstructure of concrete can be identified using appropriate techniques sensitive to detect changes in concrete components that occur at micro level. The main items considered in present chapter are:
1.
Chemical Degradation reactions
 
2.
Physical degradation processes
 
3.
Thermal changes.
 
Maria Cruz Alonso, Ulrich Schneider

Chapter 3. Mass Transport Properties

Abstract
This chapter reports experimental investigations on transport properties in high performance concrete. The first part looks at the evolution of the different transport properties during the heating of concrete. A second part reports the experimental results on the evolution of permeability of concrete (with and without polypropylene fibres) after heating. The third part presents a discussion of the influence of concrete parameters and heating conditions on mass transport at temperature above 100 ℃.
Gérard Debicki

Chapter 4. Thermal Properties

Abstract
Thermal properties have a fundamental influence on the behaviour of building materials during fire exposure as heat penetration governs the degradation of the mechanical properties and in a larger perspective the performance of the whole member or structure. The most cited set of effective thermal properties for concrete is found in the Eurocode. However, these are effective thermal properties meaning that they are not fundamental properties as they implicitly include effects of moisture transport and are fitted to give the best possible match between experimental data and calculations. This chapter gives a more detailed picture of the influences on thermal properties from different factors with the main focus on high performance concrete.
Robert Jansson McNamee, Pierre Pimienta, Roberto Felicetti

Chapter 5. Mechanical Properties

Abstract
This chapter report the most recent experimental results on mechanical behaviour at high temperature of high-performance concretes. After a short introduction, Sect. 5.2 describes the main testing methods that were used in the analysed studies. Section 5.3 collects and compares the temperature-dependency of the compressive strength and modulus of elasticity of many experimental studies. The influence of parameters such as the initial compressive strength, the type of aggregate, the presence of additions, the W/C ratio, the moisture content and the way the mechanical test was performed is analysed. Section 5.4 presents the experimental results obtained under a constant temperature, i.e. creep tests at high temperature. Section 5.5 presents experimental results obtained under increasing temperature. These results allow assessing the free thermal strain of concrete (when no mechanical load is applied) and the so-called “transient thermal strain”. Finally, Sect. 5.6 collects and analyses the few results concerning the temperature-dependency of the tensile strength of high-performance concretes.
Pierre Pimienta, Jean-Christophe Mindeguia, Gérard Debicki, Ulrich Diederichs, Izabela Hager, Sven Huismann, Ulla-Maija Jumppanen, Fekri Meftah, Katarzyna Mróz, Klaus Pistol

Chapter 6. Conclusion

Without Abstract
Pierre Pimienta, Robert Jansson McNamee, Jean-Christophe Mindeguia
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