Diagnosis And Control Of Alkali Aggregate Reactions In Concrete
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Diagnosis And Control Of Alkali Aggregate Reactions In Concrete
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Author : James A. Farny
language : en
Publisher:
Release Date : 1997
Diagnosis And Control Of Alkali Aggregate Reactions In Concrete written by James A. Farny and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Technology & Engineering categories.
Aggregates containing certain constituents can react with alkali hydroxides in concrete. The reactivity is potentially harmful only when it produces significant expansion. This alkali-aggregate reactivity (AAR) has two forms--alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR, sometimes called alkali-carbonate rock reaction, or ACRR). ASR is of more concern than ACR because the occurrence of aggregates containing reactive silica minerals is more common. Alkali-reactive carbonate aggregates have a specific composition that is not very common. Alkali-silica reactivity has been recognized as a potential source of distress in concrete since the later 1930s. Even though potentially reactive aggregates exist throughout North America, ASR distress in structural concrete is not common. There are a number of reasons for this: 1. Most aggregates are chemically stable in hydraulic-cement concrete 2. Aggregates with good service records are abundant in many areas 3. The concrete in service is dry enough to inhibit ASR 4. The use of certain pozzolans or slags controls ASR 5. In many concrete mixtures, the alkali content of the concrete is low enough to control harmful ASR 6. Some forms of ASR do not produce significant deleterious expansion To reduce ASR potential requires understanding the ASR mechanism; properly using tests to identify potentially reactive aggregates; and, if needed, taking steps to minimize the potential for expansion and related cracking. Alkali-carbonate reaction in concrete was not documented until 1957. Although ACR is much less common, this report also briefly reviews the mechanism, visual distress symptoms, identification tests, and control measures.
Alkali Aggregate Reaction In Concrete
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Author : Ian Sims
language : en
Publisher: CRC Press
Release Date : 2017-08-01
Alkali Aggregate Reaction In Concrete written by Ian Sims and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-01 with Science categories.
Alkali-Aggregate Reaction in Concrete: A World Review is unique in providing authoritative and up to date expert information on the causes and effects of Alkali-Aggregate Reaction (AAR) in concrete structures worldwide. In 1992 a first edition entitled The Alkali-Silica Reaction in Concrete, edited by Professor Narayan Swamy, was published in a first attempt to cover this concrete problem from a global perspective, but the coverage was incomplete. This completely new edition offers a fully updated and more universal coverage of the world situation concerning AAR and includes a wealth of new evidence and research information that has accumulated in the intervening years. Although there are various textbooks offering readers sections that deal with AAR deterioration and damage to concrete, no other single book brings together the views of recognised international experts in the field, and the wealth of scattered research information that is available. It provides a ‘state of the art’ review and deals authoritatively with the mechanisms of AAR, its diagnosis and how to treat concrete affected by AAR. It is illustrated by numerous actual examples from around the world, and comprises specialist contributions provided by senior engineers and scientists from many parts of the world. The book is divided into two distinct but complementary parts. The first five chapters deal with the most recent findings concerning the mechanisms involved in the reaction, methods concerning its diagnosis, testing and evaluation, together with an appraisal of current methods used in its avoidance and in the remediation of affected concrete structures. The second part is divided into eleven chapters covering each region of the world in turn. These chapters have been written by experts with specialist knowledge of AAR in the countries involved and include an authoritative appraisal of the problem and its solution as it affects concrete structures in the region. Such an authoritative compilation of information on AAR has not been attempted previously on this scale and this work is therefore an essential source for practising and research civil engineers, consultant engineers and materials scientists, as well as aggregate and cement producers, designers and concrete suppliers, especially regarding projects outside their own region.
Guide To Diagnosis And Appraisal Of Aar Damage To Concrete In Structures
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Author : Bruno Godart
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-08
Guide To Diagnosis And Appraisal Of Aar Damage To Concrete In Structures written by Bruno Godart and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-08 with Technology & Engineering categories.
This book describes procedures and methodologies used predominantly to obtain a diagnosis of damaged concrete possibly caused by Alkali-Aggregate Reaction (AAR). It has two primary objectives, namely firstly to identify the presence of AAR reaction, and whether or not the reaction is the primary or contributory cause of damage in the concrete; and secondly, to establish its intensity (severity) in various members of a structure. It includes aspects such as field inspection of the structure, sampling, petrographic examination of core samples, and supplementary tests and analyses on cores, such as mechanical tests and chemical analysis. Evaluation of test data for prognosis, consequences and appraisal will be more fully set out in AAR-6.2.
Guide To The Evaluation And Management Of Concrete Structures Affected By Alkali Aggregate Reaction
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Author : CSA International
language : en
Publisher:
Release Date : 2000
Guide To The Evaluation And Management Of Concrete Structures Affected By Alkali Aggregate Reaction written by CSA International and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Alkali-aggregate reactions categories.
This Guide has been written by Canadian experts on the diagnosis and treatment of concrete structures affected by alkali-aggregate reaction (AAR). The purpose of the Guide is to provide information on the signs and symptoms of concrete affected by AAR, how to identify AAR and distinguish it from other mechanisms of concrete deterioration, and how to assess the extent and severity of AAR in concrete. It also provides advice on the best ways of evaluating, maintaining, and treating structures affected by AAR. This guide will be of use to people involved in such work and to the owners of structures affected by AAR.
Alkali Aggregate Reaction In Concrete
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Author :
language : en
Publisher:
Release Date : 2000
Alkali Aggregate Reaction In Concrete written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
This paper presents theoretical and applied state-of-the-art information in the field of alkali-aggregate reactivity (AAR) in concrete. The aspects discussed include basic concepts of the reaction and expansion mechnasims, conditions conducive to the development and the sustainability of AAR in concrete, field and laboratory investigation program for evaluating the potential alkali-reactivity of concret aggregates, selection of preventive measures against AAR, and the management of structures affected by AAR. The management section includes the diagnosis of AAR in existing concrete structures, evaluation of potential for future distress due to AAR, and mitigation and repair approaches used on such structures. This is an introductory paper and sets the stage for a special review of the current AAR situation in the various regions of Canada that is presented in seven papers as part of this issue.
Alkali Aggregate Reaction And Structural Damage To Concrete
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Author : Geoffrey E. Blight
language : en
Publisher: CRC Press
Release Date : 2011-01-18
Alkali Aggregate Reaction And Structural Damage To Concrete written by Geoffrey E. Blight and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-01-18 with Science categories.
Since AAR was first identified in 1940, it has been a subject dominated by studies of the mineralogy of AAR-susceptible aggregates, the chemistry of the AAR and related reactions and laboratory tests used to diagnose AAR and predict potential future swelling. Civil and structural engineers have found the literature bewildering and difficult to appl
Proceedings Of The 17th International Conference On Alkali Aggregate Reaction In Concrete
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Author : Leandro F. M. Sanchez
language : en
Publisher: Springer Nature
Release Date :
Proceedings Of The 17th International Conference On Alkali Aggregate Reaction In Concrete written by Leandro F. M. Sanchez and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
The Alkali Silica Reaction In Concrete
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Author : R N Swamy
language : en
Publisher: CRC Press
Release Date : 1991-09-01
The Alkali Silica Reaction In Concrete written by R N Swamy and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-09-01 with Architecture categories.
This book reviews the fundamental causes and spectrum effects of ASR. It considers he advances that have been made in our understanding of this problem throughout the world.
Guide To Diagnosis And Appraisal Of Aar Damage To Concrete In Structures
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Author : Bruno Godart
language : en
Publisher: Springer
Release Date : 2013-04-30
Guide To Diagnosis And Appraisal Of Aar Damage To Concrete In Structures written by Bruno Godart and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-30 with Aggregates (Building materials) categories.
This book describes procedures and methods for obtaining a diagnosis of concrete damage caused by Alkali-Aggregate Reaction (AAR). Covers field inspection, sampling, petrographic examination of core samples and supplementary tests and analyses on cores.
Proceedings Of The 17th International Conference On Alkali Aggregate Reaction In Concrete
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Author : Leandro F.M. Sanchez
language : en
Publisher: Springer
Release Date : 2024-06-07
Proceedings Of The 17th International Conference On Alkali Aggregate Reaction In Concrete written by Leandro F.M. Sanchez and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-06-07 with Technology & Engineering categories.
This book gathers the peer-reviewed papers presented at the 17th International Conference on Alkali-Aggregate Reaction in Concrete (ICAAR), held in Ottawa, Ontario, Canada, on May 19-24, 2024. It highlights the latest advances and innovations in the field of internal swelling reactions, particularly alkali-aggregate reaction (AAR), and combined mechanisms such as delayed ettringite formation (DEF). The conference topics encompass understanding the reaction mechanisms and the affecting factors; testing methods and preventative measures; diagnosis, evaluation, and prognosis; monitoring and NDT; structural effects and modeling at all scales; repair and remedial measures; and combined mechanisms (e.g., DEF). The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster new multidisciplinary collaborations.