The development of NDT (non-destructive testing) techniques used for the inspection of concrete structures is currently in high demand, because many existing structures have become aged and deteriorated in service. In order to formulate predictions on their stability and to estimate their safety, it is necessary to identify damage signals and to determine their causes. In this regard, the development and establishment of innovative and highly advanced non-destructive methods are required. Acoustic Emission (AE) and related NDE (non-destructive evaluation) techniques have been extensively used to determine crack detection and damage evaluation in concrete.
With the move towards a more sustainable society, and the need to extend the long-term service life of infrastructure and aging and disastrous damage due to recent earthquakes, Acoustic Emission (AE) and Related Non-destructive Evaluation (NDE) Techniques in the Fracture Mechanics of Concrete: Fundamentals and Applications is a critical reference source for civil engineers, contractors working in construction and materials scientists working both in industry and academia.
- Presents innovative Acoustic Emission (AE) and related non-destructive evaluation (NDE) techniques, used for damage detection and inspection of aged and deteriorated concrete structures
- Contributions from recognized world-leaders in the application of acoustic emission (AE) and NDE techniques used for the damage assessment of concrete and concrete structures
- With the move towards a more sustainable society, and the need to extend the long-term service life of infrastructure and damage due to recent earthquakes, this book is of critical importance
- An essential knowledge resource for civil engineers, contractors working in construction and materials scientists working both in industry and academia
The development of NDT (non-destructive testing) techniques used for the inspection of concrete structures is currently in high demand, because many existing structures have become aged and deteriorated in service. In order to formulate predictions on their stability and to estimate their safety, it is necessary to identify damage signals and to determine their causes. In this regard, the development and establishment of innovative and highly advanced non-destructive methods are required. Acoustic Emission (AE) and related NDE (non-destructive evaluation) techniques have been extensively used to determine crack detection and damage evaluation in concrete. With the move towards a more sustainable society, and the need to extend the long-term service life of infrastructure and aging and disastrous damage due to recent earthquakes, Acoustic Emission (AE) and Related Non-destructive Evaluation (NDE) Techniques in the Fracture Mechanics of Concrete: Fundamentals and Applications is a critical reference source for civil engineers, contractors working in construction and materials scientists working both in industry and academia. Presents innovative Acoustic Emission (AE) and related non-destructive evaluation (NDE) techniques, used for damage detection and inspection of aged and deteriorated concrete structures Contributions from recognized world-leaders in the application of acoustic emission (AE) and NDE techniques used for the damage assessment of concrete and concrete structures With the move towards a more sustainable society, and the need to extend the long-term service life of infrastructure and damage due to recent earthquakes, this book is of critical importance An essential knowledge resource for civil engineers, contractors working in construction and materials scientists working both in industry and academia
Damage evaluation in concrete materials by acoustic emission
Abstract
For detailed inspections of concrete structures, core samples are often drilled out and then mechanical properties of the concrete are measured. In this chapter, damage estimation for concrete materials by the compression test of core samples by applying acoustic emission (AE) measurement and the scalar damage parameter in damage mechanics is introduced. The procedure is named DeCAT (damage estimation of concrete by acoustic emission technique), which is based on estimating the intact modulus of elasticity in concrete. AE behavior of the concrete core under compression is analyzed by rate-process analysis, and mechanical behavior is approximated by the Loland model. Then, quantitative damage of the core concrete is evaluated as the relative damage by applying DeCAT.
Keywords
Acoustic emission; Concrete damage; Damage mechanics; Rate-process analysis
1.1. Introduction
1.2. Damage estimation of concrete by acoustic emission technique (DeCAT) procedure
1.2.1. Acoustic emission rate-process analysis
(V)ⅆV=ⅆNN
(1.1)
(V)=aV+b
(1.2)
=CVaexp(bV)
(1.3)
1.2.2. Damage mechanics
=1−EE∗
(1.4)
=Ω0+A0ελ
(1.5)
=(E0−E∗A0ελ)ε
(1.6)
0=E∗(1−Ω0)
(1.7)
c=E0−E∗A0εcλ
(1.8)
1.2.3. Database development
=E0ε−E∗A0ελ+1
(1.9)
′=a′X+Y
+(a×100)=(a×100)X+Y
(1.10)
=EcE0−Ec
(1.11)
∗=Ec+EcY
(1.12)
′=E∗E0×100
(1.13)
1.3. Comparison...
Erscheint lt. Verlag | 28.3.2015 |
---|---|
Sprache | englisch |
Themenwelt | Technik ► Architektur |
Technik ► Bauwesen | |
Technik ► Maschinenbau | |
ISBN-10 | 1-78242-345-1 / 1782423451 |
ISBN-13 | 978-1-78242-345-4 / 9781782423454 |
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eReader: Dieses eBook kann mit (fast) allen eBook-Readern gelesen werden. Mit dem amazon-Kindle ist es aber nicht kompatibel.
Smartphone/Tablet: Egal ob Apple oder Android, dieses eBook können Sie lesen. Sie benötigen eine
Geräteliste und zusätzliche Hinweise
Zusätzliches Feature: Online Lesen
Dieses eBook können Sie zusätzlich zum Download auch online im Webbrowser lesen.
Buying eBooks from abroad
For tax law reasons we can sell eBooks just within Germany and Switzerland. Regrettably we cannot fulfill eBook-orders from other countries.
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