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Diagnosis and Control of Alkali-aggregate Reactions in Concrete

Diagnosis and Control of Alkali-aggregate Reactions in Concrete
Author: James A. Farny
Publisher:
Total Pages: 28
Release: 1997
Genre: Technology & Engineering
ISBN:

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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

Alkali-Aggregate Reaction in Concrete
Author: Ian Sims
Publisher: CRC Press
Total Pages: 768
Release: 2017-08-01
Genre: Science
ISBN: 1317484428

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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

Alkali-aggregate Reaction in Concrete
Author: National Council for Cement and Building Materials (India)
Publisher:
Total Pages:
Release: 1985
Genre:
ISBN:

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Guide to the Evaluation and Management of Concrete Structures Affected by Alkali-aggregate Reaction

Guide to the Evaluation and Management of Concrete Structures Affected by Alkali-aggregate Reaction
Author: CSA International
Publisher:
Total Pages: 108
Release: 2000
Genre: Alkali-aggregate reactions
ISBN: 9781553241683

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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 and Structural Damage to Concrete

Alkali-Aggregate Reaction and Structural Damage to Concrete
Author: Geoffrey E. Blight
Publisher: CRC Press
Total Pages: 250
Release: 2011-01-18
Genre: Science
ISBN: 0203093216

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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


Alkali-aggregate Reaction in Concrete

Alkali-aggregate Reaction in Concrete
Author:
Publisher:
Total Pages: 25
Release: 2000
Genre:
ISBN:

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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.


RILEM Recommendations for the Prevention of Damage by Alkali-Aggregate Reactions in New Concrete Structures

RILEM Recommendations for the Prevention of Damage by Alkali-Aggregate Reactions in New Concrete Structures
Author: Philip J. Nixon
Publisher: Springer
Total Pages: 181
Release: 2015-09-30
Genre: Technology & Engineering
ISBN: 9401772525

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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.


Guide to Diagnosis and Appraisal of AAR Damage to Concrete in Structures

Guide to Diagnosis and Appraisal of AAR Damage to Concrete in Structures
Author: Bruno Godart
Publisher: Springer
Total Pages: 104
Release: 2013-04-30
Genre: Aggregates (Building materials)
ISBN: 9789400765689

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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.


The Diagnosis of Alkali-silica Reaction

The Diagnosis of Alkali-silica Reaction
Author: D. Palmer
Publisher:
Total Pages: 36
Release: 1988
Genre: Alkali-aggregate reactions
ISBN: 9780721013695

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Written by a working party whose members were drawn from a number of organizations concerned with ASR and its diagnosis, this report is intended to assist investigators and laboratory staff in their work. But it is also written with the engineer and the structure's owner in mind, so that they may have a better understanding of what is needed to produce a reliable diagnosis of ASR. It contains a general introduction and deals with site inspection, sampling, laboratory investigation and assessment of the results. There is also some guidance on assessing the future of a structure in which ASR has been diagnosed.