Testing Aggregates Method For The Assessment Of Alkali Silica Reactivity Potential Accelerated Mortar Bar Method

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Testing Aggregates. Method for the Assessment of Alkali-Silica Reactivity. Potential Accelerated Mortar-Bar Method

Author : British Standards Institute Staff
Publisher :
ISBN 13 : 9780580282843
Total Pages : 12 pages
Book Rating : 4.2/5 (828 download)

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Book Synopsis Testing Aggregates. Method for the Assessment of Alkali-Silica Reactivity. Potential Accelerated Mortar-Bar Method by : British Standards Institute Staff

Download or read book Testing Aggregates. Method for the Assessment of Alkali-Silica Reactivity. Potential Accelerated Mortar-Bar Method written by British Standards Institute Staff and published by . This book was released on 1999-06-15 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aggregates, Cement and concrete technology, Chemical reactions, Expansion (deformation), Dimensional changes, Alkalis, Silicon dioxide, Concretes, Mortars, Grades (quality), Test specimens, Dimensional measurement, Fine aggregates, Coarse aggregates, Specimen preparation, Sampling methods, Testing conditions, Test equipment, Test duration, Sodium hydroxide, Petrographic analysis, Reproducibility, Bibliography, Reports

Standard Test Method for Determining the Potential Alkali-silica Reactivity of Combinations of Cementitious Materials and Aggregate (Accelerated Mortar-Bar Method).

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Author : American Society for Testing and Materials. Committee C09 on Concrete and Concrete Aggregates
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (958 download)

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Book Synopsis Standard Test Method for Determining the Potential Alkali-silica Reactivity of Combinations of Cementitious Materials and Aggregate (Accelerated Mortar-Bar Method). by : American Society for Testing and Materials. Committee C09 on Concrete and Concrete Aggregates

Download or read book Standard Test Method for Determining the Potential Alkali-silica Reactivity of Combinations of Cementitious Materials and Aggregate (Accelerated Mortar-Bar Method). written by American Society for Testing and Materials. Committee C09 on Concrete and Concrete Aggregates and published by . This book was released on 2004 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Standard Test Method for Determining the Potential Alkali-Silica Reactivity of Combinations of Cementitious Materials and Aggregate Accelerated Mortar-Bar Method

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Standard Test Method for Determining the Potential Alkali-Silica Reactivity of Combinations of Cementitious Materials and Aggregate Accelerated Mortar-Bar Method by :

Download or read book Standard Test Method for Determining the Potential Alkali-Silica Reactivity of Combinations of Cementitious Materials and Aggregate Accelerated Mortar-Bar Method written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Alkali-Aggregate Reaction in Concrete

Author : Marc-Andre Berube
Publisher :
ISBN 13 : 9782884492157
Total Pages : pages
Book Rating : 4.4/5 (921 download)

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Book Synopsis Alkali-Aggregate Reaction in Concrete by : Marc-Andre Berube

Download or read book Alkali-Aggregate Reaction in Concrete written by Marc-Andre Berube and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method).

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (839 download)

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Book Synopsis Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method). by :

Download or read book Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method). written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Alkali-Aggregate Reaction in Concrete

Author : Ian Sims
Publisher : CRC Press
ISBN 13 : 1317484428
Total Pages : 768 pages
Book Rating : 4.3/5 (174 download)

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Book Synopsis Alkali-Aggregate Reaction in Concrete by : Ian Sims

Download or read book Alkali-Aggregate Reaction in Concrete written by Ian Sims and published by CRC Press. This book was released on 2017-08-01 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Study of Alkali-Silica Reactivity Tests to Improve Correlation and Predictability for Aggregates

Author : WJ. Heck
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Study of Alkali-Silica Reactivity Tests to Improve Correlation and Predictability for Aggregates by : WJ. Heck

Download or read book Study of Alkali-Silica Reactivity Tests to Improve Correlation and Predictability for Aggregates written by WJ. Heck and published by . This book was released on 1983 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluation of ASTM Tests for Potential Reactivity of Chemical Aggregates (Chemical Method) (C 289), Potential Alkali Reactivity Cement-Aggregate Combination (Mortar-Bar Method) (C 227), and Petrographic Examination of Aggregates for Concrete (C 295) for predicting alkali-silica reactivity potential of aggregates was undertaken using a natural siliceous sand and a manufactured limestone sand to which 2, 5, 10, and 20% by weight of reactive materials (chert and opaline sandstone) were added. Three aggregate gradings were tried in the mortar-bar test. None of the test methods by themselves are adequate to predict alkalisilica reactivity potential; furthermore, the chemical test did not correlate well with the limit of mortar-bar expansion at an age of six months as indicative of reactive aggregate. There is a linear trend between the amount of reactive material and the amount of soluble silica by weight added to the sands and reduction of alkalinity determined by the chemical test. A similar linear relationship is shown between the amount of soluble silica and the amount of reactive material in the aggregate as determined by petrographic examination. The pessimum proportion of the reactive material was found to be around 10% by weight. Coarser graded aggregate tended to produce greater expansion, but this was not definitely established. Mortar-bar expansion tends to be highly variable with increase of amount of reactive material over 2%. The test data indicates that the limit of mortar-bar expansion of 0.1% at six months does not adequately define potentially reactive material. It is suggested that the limit should be lowered to 0.075% at six months. Because of the effect of grading and the variability of expansion, consideration should be given to replacing the mortar-bar test with a concrete-prism test. Limestone aggregate appears to have an inhibiting effect on alkali-silica reactivity, therefore, adding limestone to reactive aggregates may be a practical way to make them usable in concrete. Further testing should be conducted to establish the minimum amount of limestone required to effectively inhibit reactivity.

The Alkali-Silica Reaction in Concrete

Author : R N Swamy
Publisher : CRC Press
ISBN 13 : 0203036638
Total Pages : 288 pages
Book Rating : 4.2/5 (3 download)

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Book Synopsis The Alkali-Silica Reaction in Concrete by : R N Swamy

Download or read book The Alkali-Silica Reaction in Concrete written by R N Swamy and published by CRC Press. This book was released on 1991-09-01 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Standard Method of Test for Potential Alkali Reactivity of Cement-aggregate Combinations (mortar Bar Method).

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (135 download)

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Book Synopsis Standard Method of Test for Potential Alkali Reactivity of Cement-aggregate Combinations (mortar Bar Method). by :

Download or read book Standard Method of Test for Potential Alkali Reactivity of Cement-aggregate Combinations (mortar Bar Method). written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Alkali-Aggregate Reaction in Concrete

Author : Ian Sims
Publisher : CRC Press
ISBN 13 : 131748441X
Total Pages : 1044 pages
Book Rating : 4.3/5 (174 download)

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Book Synopsis Alkali-Aggregate Reaction in Concrete by : Ian Sims

Download or read book Alkali-Aggregate Reaction in Concrete written by Ian Sims and published by CRC Press. This book was released on 2017-08-01 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Standard Test Method for Potential Alkali Reactivity of Cement-aggregate Combinations (mortar-bar Method).

Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (957 download)

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Book Synopsis Standard Test Method for Potential Alkali Reactivity of Cement-aggregate Combinations (mortar-bar Method). by :

Download or read book Standard Test Method for Potential Alkali Reactivity of Cement-aggregate Combinations (mortar-bar Method). written by and published by . This book was released on 2005 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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

Author : Philip J. Nixon
Publisher : Springer
ISBN 13 : 9401772525
Total Pages : 181 pages
Book Rating : 4.4/5 (17 download)

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Book Synopsis RILEM Recommendations for the Prevention of Damage by Alkali-Aggregate Reactions in New Concrete Structures by : Philip J. Nixon

Download or read book RILEM Recommendations for the Prevention of Damage by Alkali-Aggregate Reactions in New Concrete Structures written by Philip J. Nixon and published by Springer. This book was released on 2015-09-30 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

New Hampshire's Concrete Aggregate and Alkali-silica Reactivity

Author : Richard M. Lane
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis New Hampshire's Concrete Aggregate and Alkali-silica Reactivity by : Richard M. Lane

Download or read book New Hampshire's Concrete Aggregate and Alkali-silica Reactivity written by Richard M. Lane and published by . This book was released on 2002 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alkali-silica reactivity (ASR) has become a major concern with regards to long-term durability of concrete structures in New Hampshire. The objectives of this research were the following: determine the potential for the development of ASR in concrete using fine and coarse aggregates in New Hampshire; confirm the presence and extent of ASR in existing NHDOT concrete structures; identify the types of rocks in New Hampshire that are potentially reactive; and evaluate the need for an additional study to determine the amount of admixtures required for the minimization of ASR in new concrete within New Hampshire.

The Use of Accelerated Mortar Bar Test Methods for Assessment of Alkali-aggregate Reactivity of Aggregate in Hong Kong

Author : K. K. Liu
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (622 download)

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Book Synopsis The Use of Accelerated Mortar Bar Test Methods for Assessment of Alkali-aggregate Reactivity of Aggregate in Hong Kong by : K. K. Liu

Download or read book The Use of Accelerated Mortar Bar Test Methods for Assessment of Alkali-aggregate Reactivity of Aggregate in Hong Kong written by K. K. Liu and published by . This book was released on 2004 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Proposed Universal Accelerated Test for Alkali-Aggregate Reaction The Concrete Microbar Test

Author : PE. Grattan-Bellew
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Proposed Universal Accelerated Test for Alkali-Aggregate Reaction The Concrete Microbar Test by : PE. Grattan-Bellew

Download or read book Proposed Universal Accelerated Test for Alkali-Aggregate Reaction The Concrete Microbar Test written by PE. Grattan-Bellew and published by . This book was released on 2003 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Concrete Microbar Test is modified after a Chinese test, for alkali-carbonate reactive aggregates. The protocol for the test is essentially the same as for ASTM C 1260, Standard Test Method for Determining the Potential Alkali-Silica Reactivity of Combinations of Cementitious Materials and Aggregate (Accelerated Mortar Bar Method), except for the size of the bars, the grading of the aggregate, the water to cement ratio and the length of the test. The concrete microbars are 40 by 40 by 160 mm. The aggregate is graded to pass a 12.5 mm sieve and be retained on a 4.75 mm sieve. The water to cement ratio is 0.33. The length of the test is 30 days in 1 M sodium hydroxide (NaOH) at 80°C. The test results show that the method is applicable to both alkali-carbonate and alkali-silica reactive aggregates. Moderate correlation was found between the expansions measured in this test at 30 days, and in the concrete prism test (CSA A23.2-14A) at 1 year. Alkali-carbonate reactive aggregates may be distinguished from alkali-silica reactive aggregates in this test by replacing a portion of the portland cement by a supplementary cementing material. The expansions of alkali-silica reactive aggregates, in this test, are significantly reduced by the presence of the supplementary cementing material but expansion of alkali-carbonate reactive aggregates is largely unaffected. It is tentatively suggested that the expansion limit to separate deleteriously alkali silica reactive siliceous limestones from innocuous limestones is 0.140 % at 30 days; the proposed limit for all other aggregates is 0.04 %.

Alkali-aggregate Reaction in Concrete Roads and Bridges

Author : Graham West
Publisher : Thomas Telford
ISBN 13 : 9780727720696
Total Pages : 182 pages
Book Rating : 4.7/5 (26 download)

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Book Synopsis Alkali-aggregate Reaction in Concrete Roads and Bridges by : Graham West

Download or read book Alkali-aggregate Reaction in Concrete Roads and Bridges written by Graham West and published by Thomas Telford. This book was released on 1996 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Ultra-accelerated Assessment of Alkali-reactivity of Aggregates by Nonlinear Acoustic Techniques

Author : Jun Chen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (68 download)

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Book Synopsis Ultra-accelerated Assessment of Alkali-reactivity of Aggregates by Nonlinear Acoustic Techniques by : Jun Chen

Download or read book Ultra-accelerated Assessment of Alkali-reactivity of Aggregates by Nonlinear Acoustic Techniques written by Jun Chen and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research develops two novel experimental techniques based on nonlinear acoustics/ultrasound to provide an ultra-accelerated characterization of alkali-reactivity of aggregates. Alkali-silica reaction (ASR) is a deleterious reaction occurring between reactive siliceous minerals present in some aggregates and alkalis mainly contributed by the cement, but also present in some deicing chemicals. With increasing reports of ASR-induced damage in transportation structures, there is a critical need for fast and reliable test methods for the screening of aggregates and aggregate/paste combinations. Currently, the accelerated mortar bar test (AMBT), which measures expansion, is the most commonly used test method. Also used is the concrete prism test (CPT), another expansion-based method, which requires at least one year testing time, limiting the practical utility of this method. In addition, petrographic analysis can be performed to identify potentially reactive minerals in aggregates but requires training and may not be appropriate for assessment of aggregate/paste combinations. Finally, linear acoustic methods such as wave speed and attenuation measurements can be used for the assessment of ASR, but the sensitivity of linear acoustic methods to ASR-induced damage is considered to be relatively low. Therefore, critical limitations exist in the existing test methods. In light of recent advances in nonlinear acoustics (which are more sensitive to small-scale damage than linear acoustics), the purpose of this research is the development and assessment of an accelerated method for evaluating the potential for alkali reactivity in aggregate and aggregate/paste combinations by combining advanced ultrasonic methods with standard test procedures. In fact, two nonlinear acoustic methods are developed under this research - nonlinear wave modulation spectroscopy (NWMS) and nonlinear impact resonance acoustic spectroscopy (NIRAS) - and are used to characterize the changes in material nonlinearity as a result of the progressive ASR damage during the standard mortar bar and concrete prism testing. Following the AMBT and CPT, nonlinear acoustic techniques are applied to both mortar bars and concrete prism samples. Nonlinearity parameters are defined as the indicator of growing ASR damage, and measurement results clearly show that these nonlinearity parameters are more sensitive to the ASR damage than the linear parameters used in the linear acoustic measurements, particularly at early ages. Different aggregates with varying alkali-reactivity are effectively distinguished with the proposed experimental techniques in a timely manner, particularly for those aggregates with similar levels of reactivity, as determined by AMBT.