Download or read book Petrographic Atlas Characterisation of Aggregates Regarding Potential Reactivity to Alkalis written by Isabel Fernandes and published by Springer. This book was released on 2016-03-18 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: This RILEM AAR 1.2 Atlas is complementary to the petrographic method described in RILEM AAR 1.1. It is designed and intended to assist in the identification of alkali-reactive rock types in concrete aggregate by thin-section petrography. Additional issues include: • optical thin-section petrography conforming to RILEM AAR 1.1 is considered the prime assessment method for aggregate materials, being effective regarding cost and time. Unequivocal identification of minerals in very-fine grained rock types may however require use of supplementary methods. • the atlas adheres to internationally adopted schemes for rock classification and nomenclature, as recommended in AAR 1.1. Thus, rock types are classified as igneous, sedimentary or metamorphic based upon mineral content, microstructure and texture/fabric. • in addition, the atlas identifies known alkali-reactive silica types in each rock type presented. It also identifies consistent coincidence between certain lithologies and silica types; however, it refrains from attributing alkali-reactivity to a specific silica property or quality. • operator skill and experience remain essential for reliable assessment by thin-section petrography. • aggregate materials must be classified according to local criteria, based on regional experiences with ASR-damaged field structures and geology. Access to additional data may be relevant for the assessment of imported materials. • mere application of rock nomenclature does not provide any sort of warranty to the development of deleterious alkali-reaction. Such may result in either rejection of a suitable aggregate material, thus wasting a valuable resource, or acceptance of an unsuitable material leading to concrete damage, both of which are undesirable.

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.

Download or read book Internal Swelling Reactions in Concrete written by Leandro F. M. Sanchez and published by CRC Press. This book was released on 2024-02-19 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: As critical concrete infrastructure deteriorates, engineers need efficient and reliable techniques to appraise the causes and the extent of deterioration, to evaluate the structural consequences and to select effective management protocols and rehabilitation strategies. This book looks at deterioration caused by internal swelling reaction (ISR) mechanisms in concrete, such as alkali-aggregate reaction, delayed ettringite formation and freeze-thaw cycles. The book provides accessible and comprehensive coverage of recent work and developments on the most common ISR mechanisms leading to induced expansion and deterioration. It addresses the implications of ISR on different scales (micro, meso and macro), outlines qualitative and quantitative techniques to assess the condition of affected concrete and introduces the multi-level assessment protocol, using advanced microscopic and mechanical techniques, particularly the stiffness damage test and damage rating index, as a reliable approach to appraise ISR-affected infrastructure. Also included is a detailed case study of the Robert-Bourassa Charest Overpass in Quebec. Internal Swelling Reactions in Concrete: Mechanisms and Condition Assessment is primarily intended for undergraduate and graduate students, as well as academics interested in the field of concrete durability and condition assessment of concrete. It will also be of interest to engineers and infrastructure owners dealing with ISR-related problems.

Download or read book Lea s Chemistry of Cement and Concrete written by Peter Hewlett and published by Butterworth-Heinemann. This book was released on 2019-02-15 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lea's Chemistry of Cement and Concrete, Fifth Edition, examines the suitability and durability of different types of cements and concretes, their manufacturing techniques and the role that aggregates and additives play in achieving concrete's full potential of delivering a high-quality, long-lasting, competitive and sustainable product. Provides a 60% revision over the fourth edition last published in 2004 Includes updated chapters that represent the latest technological advances in the industry, including, but not exclusive to the production of low-energy cements, cement admixtures and concrete aggregates Presents expanded coverage of the suitability and durability of materials aggregates and additives

Download or read book IAEG AEG Annual Meeting Proceedings San Francisco California 2018 Volume 3 written by Abdul Shakoor and published by Springer. This book was released on 2018-08-25 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is one out six IAEG XIII Congress and AEG 61st Annual Meeting proceeding volumes, and deals with topics related to mining, aggregates, and karst. The theme of the IAEG/AEG Meeting, held in San Francisco from September 17-21, 2018, is Engineering Geology for a Sustainable World. The meeting proceedings analyze the dynamic role of engineering geology in our changing world. The meeting topics and subject areas of the six volumes are: Slope Stability: Case Histories, Landslide Mapping, Emerging Technologies; Geotechnical and Environmental Site Characterization; Mining, Aggregates, Karst; Dams, Tunnels, Groundwater Resources, Climate Change; Geologic Hazards: Earthquakes, Land Subsidence, Coastal Hazards, and Emergency Response; and Advances in Engineering Geology: Education, Soil and Rock Properties, Modeling.

Download or read book Proceedings of the 17th International Conference on Alkali Aggregate Reaction in Concrete written by Leandro F. M. Sanchez and published by Springer Nature. This book was released on with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Geoengineering Geotechnologies and Geoenvironment for Earth Systems and Sustainable Georesources Management written by Helder I. Chaminé and published by Springer Nature. This book was released on 2023-05-27 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the peer-reviewed proceedings of the 1st Conference on Georesources, Geomaterials, Geotechnologies and Geoenvironment (4GEO), Porto, Portugal, on November 7–8, 2019. The book interests all researchers, practitioners, and students in engineering geosciences, geotechnics, georesources, materials engineering, and earth and environmental sciences. Georesources, geomaterials, geotechnologies, and geoenvironment are very topical subjects and therefore deserve a deeper reflection by academia, practitioners, and society. That approach is vital to a correct sustainable resource management and an engineering design with nature within a geoethical framework. Georesources, understood as geological, hydrological and energetic resources are greatly important to society. Minerals, rocks, and water are resources that, over time, have assumed an important role in the technological development of communities. Given the increase in population and the increasing needs and intensification of their use, it is very important to ensure their sustainable management. Geomaterials are functional geological materials artificially processed for the generality of the activities developed by societies. The functional geomaterials may include rock, clay, granular materials, treated soils, and industrial waste. Geotechnologies are a very important tool for decision-making, supporting the collection, mapping, processing, and analysis of data with geographical information systems and other geo-techniques used in the most diverse fields, including to support the monitoring and prediction of geohazards. The geoenvironment is a transversal field that identifies continuous earth changes and to find solutions to the resulting socioeconomic and environmental changes. Climate change, industrialization, and anthropic activity are, among others, factors of pressure and alteration of the natural environment, so minimizing impacts and emerging hazards and risks. Main topics include: 1. Geomaterials, Geotechnics, and Georesources2. Geotechnologies, Engineering Geosciences, and Geohazards3. Geoenvironment, Water, and Climate Change

Download or read book Engineering Geology for Society and Territory Volume 5 written by Giorgio Lollino and published by Springer. This book was released on 2014-08-25 with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is one out of 8 IAEG XII Congress volumes, and deals with the theme of urban geology. Along with a rapidly growing world population, the wave of urban growth continues, causing cities to swell and new metropolitan centers to emerge. These global trends also open new ventures for underground city development. Engineering geology plays a major role in facing the increasing issues of the urban environment, such as: finding aggregates for construction works; providing adequate water supply and waste management; solving building problems associated to geological and geomorphological conditions; evaluating host rock conditions for underground constructions; preventing or mitigating geological and seismic hazards. Furthermore, this book illustrates recent advancements in sustainable land use planning, which includes conservation, protection, reclamation and landscape impact of open pit mining and alternative power generation. The Engineering Geology for Society and Territory volumes of the IAEG XII Congress held in Torino from September 15-19, 2014, analyze the dynamic role of engineering geology in our changing world and build on the four main themes of the congress: environment, processes, issues and approaches. The congress topics and subject areas of the 8 IAEG XII Congress volumes are: 1. Climate Change and Engineering Geology 2. Landslide Processes River Basins 3. Reservoir Sedimentation and Water Resources 4. Marine and Coastal Processes Urban Geology 5. Sustainable Planning and Landscape Exploitation 6. Applied Geology for Major Engineering Projects 7. Education, Professional Ethics and Public Recognition of Engineering Geology 8. Preservation of Cultural Heritage

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.

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.

Download or read book Alkali Reactivity in Concretes from New Brunswick written by and published by . This book was released on 1993 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compilation of petrographic information regarding alkali aggregate (AAR) reactivity of 38 single rock types (bedrock lithologies) and 36 Quaternary natural sand and gravel sources from throughout New Brunswick. AAR potential of individual sources was made based on compositional and textural characteristics of aggregate lithologies, and laboratory expansion tests. Geological processes are accounted for that have contributed to the formation and distribution of alkali reactive domains in aggregate forming rock types.

Download or read book Guide to the Interpretation of Petrographical Examinations for Alkali Silica Reactivity written by British Standards Institute Staff and published by . This book was released on 1999-07-15 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coarse aggregates, Fine aggregates, Aggregates, Concretes, Construction materials, Chemical reactions, Petrographic analysis, Data handling, Alkalis, Silicon dioxide, Alkali-resistance tests, Classification systems, Rocks, Minerals, Geological analysis, Chemical analysis and testing, Test equipment, Test specimens, Specimen preparation, Accuracy, Reproducibility, Reports, Forms (paper), Bibliography

Download or read book Evaluation of Potential Alkali Carbonate Reactions written by RG. Drysdale and published by . This book was released on 1976 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of an integrated procedure for evaluating marginal aggregates with potentially deleterious degrees of alkali-carbonate reactivity is described. This evalation couples petrographic examination and laboratory expansion testing with a detailed field inspection of existing structures. Field inspection often indicates other sources of potential problems such as chert zones, shale pop-outs, road salt action, and the influence of high sulfate environments. In addition to providing expansion data, preparation of test prisms may indicate other problems such as poor workability. For the typical portland cements and range of alkali contents used, there was no laboratory evidence of deleterious alkali-carbonate reaction for the aggregates in question. This confirmed the field observations. It is critical that all aspects of performance, including workability and special construction precautions, be considered when examining the economics of using a marginal aggregate source.

Download or read book The Alkali aggregate Reaction in Concrete written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1958 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers a discussion of the problem of deterioration of certain concretes caused by an expansive reaction between the alkalies in the cement and certain constituents of the aggregate. Presented in 3 parts. One dealing with field experiences. A second with the laboratory tests and a third with theoretical considerations and present research.

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

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.

Download or read book Atlas of Igneous Rocks and Their Textures written by W. S. MacKenzie and published by Pearson Education. This book was released on 1982 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: A companion volume to the "Atlas of rock-forming minerals in thin section", this full-colour handbook is designed to be used as a laboratory manual both by elementary students of earth sciences undertaking a study of igneous rocks in thin section under the microscope, and by more advanced students and teachers as a reference work. The book is divided into two parts - Part one is devoted to photographs of many of the common textures found in igneous rocks with brief descriptions accompanying each photograph. Part two illustrates the appearance of examples of some sixty of the commonest (and a few not so common) igneous rock types; each photograph is accompanied by a brief description of the field of view shown. Nearly 300 full-colour photographs are included, and in many cases the same view is shown both in plen-polarized light and under crossed polars. A brief account of how thin sections can be prepared is included as an appendix.