Concrete Alkali Aggregate Reactions
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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.
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.
Alkali Aggregate Reaction
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Author : K. Okada
language : en
Publisher: CRC Press
Release Date : 2004-01-14
Alkali Aggregate Reaction written by K. Okada and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-01-14 with Architecture categories.
Proceedings of the 8th International Conference on Alkali-Aggregate Reaction held in Kyoto, Japan, 17-20 July 1989.
Concrete Alkali Aggregate Reactions
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Author : Patrick E. Grattan-Bellew
language : en
Publisher: William Andrew
Release Date : 1987
Concrete Alkali Aggregate Reactions written by Patrick E. Grattan-Bellew and has been published by William Andrew this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Alkali-aggregate reactions categories.
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.
Alkali Aggregate Reaction In Concrete
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Author : I. Sims
language : en
Publisher: CRC Press
Release Date : 2020-06-30
Alkali Aggregate Reaction In Concrete written by I. 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 2020-06-30 with Alkali-aggregate reactions categories.
This book provides an authoritative state-of-the-art review of AAR, which causes costly premature deterioration affecting many concrete structures world-wide. This unique global coverage deals with the identification, diagnosis, repair and statutory regulations concerning the deterioration of concrete structures in each country or region and has
Alkali Aggregate Reaction In Concrete Roads And Bridges
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Author : Graham West
language : en
Publisher: Thomas Telford
Release Date : 1996
Alkali Aggregate Reaction In Concrete Roads And Bridges written by Graham West and has been published by Thomas Telford this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Technology & Engineering categories.
This book provides a sound understanding of the alkali-aggregate reaction and how it affects the design, construction and maintenance of concrete roads and bridges. It draws on examples from the UK and around the world to relate experience of damage caused by this reaction and how the problems have been investigated and treated.
Rilem Recommendations For The Prevention Of Damage By Alkali Aggregate Reactions In New Concrete Structures
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Author : Philip J. Nixon
language : en
Publisher: Springer
Release Date : 2015-09-30
Rilem Recommendations For The Prevention Of Damage By Alkali Aggregate Reactions In New Concrete Structures written by Philip J. Nixon and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-09-30 with Technology & Engineering categories.
This book contains the full set of RILEM Recommendations which have been produced to enable engineers, specifiers and testing houses to design and produce concrete which will not suffer damage arising from alkali reactions in the concrete. There are five recommended test methods for aggregates (designated AAR-1 to AAR-5), and an overall recommendation which describes how these should be used to enable a comprehensive aggregate assessment (AAR-0). Additionally, there are two Recommended International Specifications for concrete (AAR-7.1 & 7.2) and a Preliminary International Specification for dams and other hydro structures (AAR-7.3), which describe how the aggregate assessment can be combined with other measures in the design of the concrete to produce a concrete with a minimised risk of developing damage from alkali-aggregate reactions.
Alkali Aggregate Reactions In Concrete
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Author : Building Research Station (Great Britain)
language : en
Publisher:
Release Date : 1988
Alkali Aggregate Reactions In Concrete written by Building Research Station (Great Britain) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Alkali-aggregate reactions categories.
Concrete can deteriorate as a result of an interaction between alkaline pore fluids principally originating from the Portland cement) and reactive minerals in certain types of aggregates. The mechanism of deterioration is known as alkali aggregate reaction (AAR); it can occur in a number of forms, the most common being alkali silica reaction (ASR). Although ASR was first identified in the USA in 1940, for many years no cases were found in the UK. In 19 71, however, the reaction was found to be the cause of cracking in a concrete dam on Jersey and in 1976 was identified as the cause of cracking in the concrete bases of electricity sub-stations in South- West England. The number of structures affected is now over 170 though this total includes only a few buildings, mainly in the South-West and Midlands of England. In relation to the vast amount of concrete in use, therefore, the amount of concrete affected is small and the problem should not be allowed to get out of perspective. It still appears that the cement/aggregate combinations in use in the UK will react together detrimentally only under adverse combinations of high cement content, high alkali in the cement and exposure to water. As this combination can occur in important structures, the reaction cannot be ignored. This digest gives guidance for both prevention of damage from AAR in future construction and on remedies for existing structures. It replaces Digest 258 which is now withdrawn.